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 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 Compound Interest 
 Key - Points: 
 1.  For  one  year  or  one  term  simple 
 interest  and  compound  interest  are  the 
 same. 
 2.  In  simple  interest  you  divide  the  simple 
 interest  by  the  number  of  years  to 
 calculate  one  year  interest  but  in 
 compound interest this is not applicable. 
 3.  Compound  Interest  is  the  interest  on 
 amount  (principal  +  Interest);  Symbol  we 
 will use ‘CI’. 
 Let  us  say  one  person  borrows  Rs.100 
 for  3  years  at  the  rate  of  10%  annually. 
 What  amount  should  he  have  to  return 
 after 3 years? 
 Here  is  the  approximation  technique  to 
 solve this problem: 
 Compound interest will be = 
 133.10 – 100 = 33.1 Rs. 
 The  above  concept  can  also  be  written 
 as: 
 Amount =  =133.10 
 100     ×     110     ×     110     ×     110 
 100     ×     100     ×     100 
 CI = Amount – Principal 
 CI = 133.10 – 100 = 33.10 
 Or,  Amount = Principal (1 +  ) 
 t 
 ?? 
 100 
 = 100 (1 +  ) 
 3 
 10 
 100 
= 100  × 
 11 
 10 
×
 11 
 10 
×
 11 
 10 
= 133 . 10 
 CI = 33.10 
 So  all  the  above  concepts  have  the  same 
 result,  but  if  you  want  to  solve  questions 
 quickly  and  without  using  formulas  then 
 it  is  advised  to  develop  mastery  on 
 approximation technique. 
 Note  :  Notice  that  in  CI,  interest  is 
 calculated  on  the  amount  at  the  end  of 
 every  year  while  in  SI  interest  for  each 
 year  is  calculated  on  the  Principal 
 amount. 
 4.  If  rate  of  interest  is  different  for 
 different  year,  let  us  say  10%  for  1 
 st 
 year, 
 20%  for  2 
 nd 
 year,  and  30%  for  3 
 rd 
 year 
 then  amount  will  be  calculated  as 
 follows: 
 We  can  also  do  it  as:  Amount  = 
 100     ×        110     ×     120     ×     130 
 100     ×     100     ×     100 
= 171 . 60     ???? .
 Important formulas : 
 Amount = A 
 Principal = P 
 Compound Interest = CI 
 Rate of interest = R 
 Time = no. of cycles = n 
 1.  CI = Amount - Principal 
 2.  When interest is compounded 
 annually : 
 A (in CI) = P  ) 
 n 
( 1 +
 ?? 
 100 
 3.  When interest is compounded 
 half-yearly : 
 A (in CI) = P  ) 
 2n 
( 1 +
 ??  /2 
 100 
 4.  When interest is compounded 
 quarterly : 
 A (in CI) = P  ) 
 4n 
( 1 +
 ??  /4 
 100 
 5.  When interest is compounded 
 monthly : 
 A (in CI) = P  ) 
 12n 
( 1 +
 ??  /12 
 100 
 6.  When the interest is compounded 
 annually and time period is given in 
 fraction, say for 3  years:- 
 2 
 5 
 A (in CI) = P  ) 
 3 
( 1 +
 ?? 
 100 
× ( 1 +
 2 
 5 
 ?? 
 100 
)
 7.  When  different  interest  rates  for 
 different  years  are  given,  say  ,  ,  ?? 
 1 
 %  ?? 
 2 
 % 
 ,  and  for  1st,  2nd,  3rd  and  4th  ?? 
 3 
 %  ?? 
 4 
 % 
 year  respectively : 
 A (in CI) = P  )  (  ) ( 1 +
 ?? 
 1 
 100 
× 1 +
 ?? 
 2 
 100 
×
 (  )  (  )  1 +
 ?? 
 3 
 100 
× 1 +
 ?? 
 4 
 100 
 8.  Equated  monthly  instalment  (EMI) 
 concept : 
 Amount borrowed = 
 ?? 
( 1    +   
 ?? 
 100 
)
 ?? 
 where  = Instalment (EMI)  ?? 
 Example  :  Find  the  amount  which  is 
 needed  to  be  paid  each  year  to  clear  the 
 debt  of  ?2,10,000  in  2  years  at  10% 
 interest rate. 
 Solution  : 
 210000 =  + 
 ?? 
( 1    +   
 10 
 100 
)
 2 
   
 ?? 
( 1    +   
 10 
 100 
)
 210000 =  + 
 ?? 
(
 11 
 10 
)
 2 
 ?? 
   (
 11 
 10 
)
 210000 =  + ?
 100  ?? 
 121 
 10  ?? 
    11 
 210000 = ?
 100  ??    +    110  ?? 
 121 
 210000 =  = ?1,21,000 ?
 210  ?? 
 121 
? ?? 
 9.  When the interest is compounded 8 
 monthly, time period is 2 years and the 
 interest rate is 12% p.a., then 
 For  12  months,  interest  rate  =  12%,  so  for 
 8 months, interest rate =  = 8% 
 8    ×    12 
 12 
 Here, time period = 2 years = 24 months 
 So,  =  3  ,  so  we  need  to  conduct  3 
 24 
 8 
 cycles  each  of  interest  rate  8%  in  order  to 
 calculate required CI. 
 10.  Effective  C.I.  rate  for  two  interest 
 rates  =  (a  +  b  +  )%,  where  a  and  b 
 ???? 
 100 
 are interest rates. 
 11.  Effective  C.I.  rate  for  three  interest 
 rates = 
 (a  +  b  +  c  +  +  )% 
 ????    +    ????    +    ???? 
 100 
 ?????? 
 10000 
 where a, b and c are interest rates. 
 12. Effective rates :- 
 Years ?
 Rate ?
 2nd  3rd  4th 
 5%  10.25%  15.7625%  21.550625% 
 10%  21%  33.1%  46.41% 
 20%  44%  72.8%  107.36% 
 Variety Questions 
 Q.1.  The  compound  interest  on  ?10,000 
 at  20%  per  annum  is  ?4,641.  If 
 compounded  half  yearly,  for  how  many 
 years was the principal invested? 
 SSC CGL Tier II  (26/10/2023) 
 (a) 4  (b) 6  (c) 3  (d) 2 
 Q.2.  Jonathan  had  borrowed  a  sum  of 
 money  3  years  ago  at  10%  interest  per 
 annum  compounded  annually  for  a 
 5-year  period,  with  the  amount  to  be  paid 
 at  the  end  of  the  period  being  ?1,61,051. 
 However,  there  is  no  prepayment  penalty 
 and  Jonathan  has  received  some  bonus 
 payment  now,  with  which  he  has  decided 
 to  clear  his  debt.  How  much  does 
 Jonathan  have  to  pay  now  to  clear  his 
 debt? 
 SSC CPO 03/10/2023 (1st Shift) 
 (a) ?1,33,100  (b) ?1,33,200 
 (c) ?1,33,000  (d) ?1,32,900 
 Q.3.  Money  is  doubled  in  a  bank  account 
 in  7  years,  when  the  Interest  is 
 compounded  annually:  What  time  in 
 years  is  needed  to  make  an  amount  8 
 times in the bank? 
 SSC MTS 14/09/2023 (2nd Shift) 
 (a) 21  (b) 14  (c) 35  (d) 28 
 Q.4.  A  bank  offers  compound  interest  at 
 the  rate  5%  per  annum  calculated  half 
 yearly  on  its  deposits.  A  customer 
 deposits  ?2,400  each  on  1st  January 
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Page 2


 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 Compound Interest 
 Key - Points: 
 1.  For  one  year  or  one  term  simple 
 interest  and  compound  interest  are  the 
 same. 
 2.  In  simple  interest  you  divide  the  simple 
 interest  by  the  number  of  years  to 
 calculate  one  year  interest  but  in 
 compound interest this is not applicable. 
 3.  Compound  Interest  is  the  interest  on 
 amount  (principal  +  Interest);  Symbol  we 
 will use ‘CI’. 
 Let  us  say  one  person  borrows  Rs.100 
 for  3  years  at  the  rate  of  10%  annually. 
 What  amount  should  he  have  to  return 
 after 3 years? 
 Here  is  the  approximation  technique  to 
 solve this problem: 
 Compound interest will be = 
 133.10 – 100 = 33.1 Rs. 
 The  above  concept  can  also  be  written 
 as: 
 Amount =  =133.10 
 100     ×     110     ×     110     ×     110 
 100     ×     100     ×     100 
 CI = Amount – Principal 
 CI = 133.10 – 100 = 33.10 
 Or,  Amount = Principal (1 +  ) 
 t 
 ?? 
 100 
 = 100 (1 +  ) 
 3 
 10 
 100 
= 100  × 
 11 
 10 
×
 11 
 10 
×
 11 
 10 
= 133 . 10 
 CI = 33.10 
 So  all  the  above  concepts  have  the  same 
 result,  but  if  you  want  to  solve  questions 
 quickly  and  without  using  formulas  then 
 it  is  advised  to  develop  mastery  on 
 approximation technique. 
 Note  :  Notice  that  in  CI,  interest  is 
 calculated  on  the  amount  at  the  end  of 
 every  year  while  in  SI  interest  for  each 
 year  is  calculated  on  the  Principal 
 amount. 
 4.  If  rate  of  interest  is  different  for 
 different  year,  let  us  say  10%  for  1 
 st 
 year, 
 20%  for  2 
 nd 
 year,  and  30%  for  3 
 rd 
 year 
 then  amount  will  be  calculated  as 
 follows: 
 We  can  also  do  it  as:  Amount  = 
 100     ×        110     ×     120     ×     130 
 100     ×     100     ×     100 
= 171 . 60     ???? .
 Important formulas : 
 Amount = A 
 Principal = P 
 Compound Interest = CI 
 Rate of interest = R 
 Time = no. of cycles = n 
 1.  CI = Amount - Principal 
 2.  When interest is compounded 
 annually : 
 A (in CI) = P  ) 
 n 
( 1 +
 ?? 
 100 
 3.  When interest is compounded 
 half-yearly : 
 A (in CI) = P  ) 
 2n 
( 1 +
 ??  /2 
 100 
 4.  When interest is compounded 
 quarterly : 
 A (in CI) = P  ) 
 4n 
( 1 +
 ??  /4 
 100 
 5.  When interest is compounded 
 monthly : 
 A (in CI) = P  ) 
 12n 
( 1 +
 ??  /12 
 100 
 6.  When the interest is compounded 
 annually and time period is given in 
 fraction, say for 3  years:- 
 2 
 5 
 A (in CI) = P  ) 
 3 
( 1 +
 ?? 
 100 
× ( 1 +
 2 
 5 
 ?? 
 100 
)
 7.  When  different  interest  rates  for 
 different  years  are  given,  say  ,  ,  ?? 
 1 
 %  ?? 
 2 
 % 
 ,  and  for  1st,  2nd,  3rd  and  4th  ?? 
 3 
 %  ?? 
 4 
 % 
 year  respectively : 
 A (in CI) = P  )  (  ) ( 1 +
 ?? 
 1 
 100 
× 1 +
 ?? 
 2 
 100 
×
 (  )  (  )  1 +
 ?? 
 3 
 100 
× 1 +
 ?? 
 4 
 100 
 8.  Equated  monthly  instalment  (EMI) 
 concept : 
 Amount borrowed = 
 ?? 
( 1    +   
 ?? 
 100 
)
 ?? 
 where  = Instalment (EMI)  ?? 
 Example  :  Find  the  amount  which  is 
 needed  to  be  paid  each  year  to  clear  the 
 debt  of  ?2,10,000  in  2  years  at  10% 
 interest rate. 
 Solution  : 
 210000 =  + 
 ?? 
( 1    +   
 10 
 100 
)
 2 
   
 ?? 
( 1    +   
 10 
 100 
)
 210000 =  + 
 ?? 
(
 11 
 10 
)
 2 
 ?? 
   (
 11 
 10 
)
 210000 =  + ?
 100  ?? 
 121 
 10  ?? 
    11 
 210000 = ?
 100  ??    +    110  ?? 
 121 
 210000 =  = ?1,21,000 ?
 210  ?? 
 121 
? ?? 
 9.  When the interest is compounded 8 
 monthly, time period is 2 years and the 
 interest rate is 12% p.a., then 
 For  12  months,  interest  rate  =  12%,  so  for 
 8 months, interest rate =  = 8% 
 8    ×    12 
 12 
 Here, time period = 2 years = 24 months 
 So,  =  3  ,  so  we  need  to  conduct  3 
 24 
 8 
 cycles  each  of  interest  rate  8%  in  order  to 
 calculate required CI. 
 10.  Effective  C.I.  rate  for  two  interest 
 rates  =  (a  +  b  +  )%,  where  a  and  b 
 ???? 
 100 
 are interest rates. 
 11.  Effective  C.I.  rate  for  three  interest 
 rates = 
 (a  +  b  +  c  +  +  )% 
 ????    +    ????    +    ???? 
 100 
 ?????? 
 10000 
 where a, b and c are interest rates. 
 12. Effective rates :- 
 Years ?
 Rate ?
 2nd  3rd  4th 
 5%  10.25%  15.7625%  21.550625% 
 10%  21%  33.1%  46.41% 
 20%  44%  72.8%  107.36% 
 Variety Questions 
 Q.1.  The  compound  interest  on  ?10,000 
 at  20%  per  annum  is  ?4,641.  If 
 compounded  half  yearly,  for  how  many 
 years was the principal invested? 
 SSC CGL Tier II  (26/10/2023) 
 (a) 4  (b) 6  (c) 3  (d) 2 
 Q.2.  Jonathan  had  borrowed  a  sum  of 
 money  3  years  ago  at  10%  interest  per 
 annum  compounded  annually  for  a 
 5-year  period,  with  the  amount  to  be  paid 
 at  the  end  of  the  period  being  ?1,61,051. 
 However,  there  is  no  prepayment  penalty 
 and  Jonathan  has  received  some  bonus 
 payment  now,  with  which  he  has  decided 
 to  clear  his  debt.  How  much  does 
 Jonathan  have  to  pay  now  to  clear  his 
 debt? 
 SSC CPO 03/10/2023 (1st Shift) 
 (a) ?1,33,100  (b) ?1,33,200 
 (c) ?1,33,000  (d) ?1,32,900 
 Q.3.  Money  is  doubled  in  a  bank  account 
 in  7  years,  when  the  Interest  is 
 compounded  annually:  What  time  in 
 years  is  needed  to  make  an  amount  8 
 times in the bank? 
 SSC MTS 14/09/2023 (2nd Shift) 
 (a) 21  (b) 14  (c) 35  (d) 28 
 Q.4.  A  bank  offers  compound  interest  at 
 the  rate  5%  per  annum  calculated  half 
 yearly  on  its  deposits.  A  customer 
 deposits  ?2,400  each  on  1st  January 
 www.ssccglpinnacle.com                                                 Download Pinnacle Exam Preparation App 589
 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 and  1st  July  of  a  year.  Find  the  amount 
 he received at the end of the year. 
 SSC MTS 12/09/2023 (2nd Shift) 
 (a)  180.50  (b)  4,981.50  ?  ? 
 (c)  181.50  (d)  4,081.50  ?  ? 
 Q.5.  What  will  be  the  present  value  of 
 ?13,230  due  two  years  hence,  when  the 
 interest  is  compounded  at  the  rate  of  5% 
 per annum ? 
 SSC CHSL 07/08/2023 (1st Shift) 
 (a) ?13,000  (b) ?10,500 
 (c) ?11,500  (d) ?12,000 
 Q.6.  If  the  difference  between  the 
 compound  interest  and  simple  interest 
 on  a  certain  sum  of  money  for  3  years  at 
 the  rate  of  4%  per  annum  is  76,  then  ? 
 what is the sum ? 
 SSC CHSL 04/08/2023 (1st Shift) 
 (a)  16,725  (b)  12,925  ?  ? 
 (c)  15,625  (d)  18,825  ?  ? 
 Q.7.  A  sum  amounts  to  ?6,120  in  2  years 
 and  ?7,340  in  3  years  at  compound 
 interest.  The  sum  (in  ?)  is  (rounded  off  to 
 2 decimal places): 
 SSC CHSL 03/08/2023 (2nd Shift) 
 (a) 4,050.13  (b) 4,254.63 
 (c) 4,850.32  (d) 4,560.23 
 Q.8.  A  certain  amount  of  money  was  lent 
 for  a  period  of  1  year  9  months  at  a  rate 
 of  10%  per  annum  compounded  annually. 
 If  the  compound  interest  is  ?1,460,  ?nd 
 the amount of money lent. 
 SSC CHSL 02/08/2023 (1st Shift) 
 (a) ?8,200  (b) ?7,500 
 (c) ?6,000  (d) ?8,000 
 Q.9.  Rs.  2400  is  lent  at  the  rate  of  10 
 percent  per  annum.  Which  of  the 
 following statement(s) is/are correct? 
 I.  The  compound  interest  (compounding 
 annually) for 3 years is Rs. 794.4. 
 II.  The  difference  between  simple  interest 
 and  compound  interest  (compounding 
 annually) after 3 years is Rs. 75.8 
 SSC MTS 18/05/2023 (Afternoon) 
 (a) None of the statements are correct 
 (b) Only statement I is correct 
 (c) Only statement II is correct 
 (d) Both statement I and II are correct 
 Q.10.  The  difference  between  compound 
 interest  and  simple  interest  on  Rs.  x  at 
 25%  per  annum  for  2  years  is  Rs.  325. 
 Find the value of x. 
 SSC MTS 10/05/2023 (Afternoon) 
 (a) Rs. 5200  (b) Rs. 4000 
 (c) Rs. 5300  (d) Rs. 2400 
 Q.11.  Rs.  6000  is  lent  at  the  annual  rate 
 of  10  percent  for  2  years.  Which  of  the 
 following is statement(s) is/are correct ? 
 I. Simple interest to be received on this 
 sum is Rs. 1200 
 II.  Compound  Interest  (compounding 
 annually)  to  be  received  on  this  sum  is 
 Rs. 1260 
 SSC CHSL 10/03/2023 (2nd Shift) 
 (a) Statement I is correct 
 (b) Both statement I and II are correct 
 (c) Statement II is correct 
 (d) None of them are correct. 
 Q.12.  A  man  borrowed  Rs.50,000  from  a 
 bank  at  10%  per  annum,  compounded 
 annually.  At  the  end  of  every  year,  he 
 pays  Rs.15,000  as  part  payment  of  the 
 loan  and  interest.  How  much  does  he  still 
 owe  to  the  bank  after  three  such 
 installments ? 
 SSC CPO 10/11/2022 (Morning) 
 (a) Rs.16,900  (b) Rs.15,800 
 (c) Rs.15,200  (d) Rs.16,200 
 Q.13.  Vipul  and  Manish  invested  the  sum 
 of  15000  and  20000  at  the  rate  of  20  ?  ? 
 percent  p.a.  and  30  percent  p.a. 
 respectively  on  compound  interest 
 (compounding  annually).  If  the  time 
 period  is  3  years  for  both,  then  what  will 
 be  the  total  compound  interest  earned  by 
 Vipul and Manish ? 
 SSC CGL Tier II (08/08/2022) 
 (a)  32480  (b)  31688  ?  ?    
 (c)  29460  (d)  34860  ?  ? 
 Q.14.  A  person  invests  Rs  55,000  for  two 
 years  on  compound  interest  such  that 
 the  rate  of  interest  for  the  ?rst  year  is  8% 
 per  annum  and  that  for  the  second  year 
 is  12%  per  annum,  and  the  interest  is 
 compounded  annually.  What  is  the  total 
 interest earned by the person ? 
 SSC MTS 20/07/2022 (Evening) 
 (a) Rs 11,645  (b) Rs 11,528 
 (c) Rs 12,386  (d) Rs 10,847 
 Q.15.  In  what  time  will  ?3,90,625  amount 
 to  ?4,56,976  at  8%  per  annum,  interest 
 being compounded half-yearly? 
 SSC CHSL 08/06/2022 (Afternoon) 
 (a) 2 years  (b)  years  1 
 1 
 2 
 (c)  years  (d) 1 years  2 
 1 
 2 
 Q.16.  A  certain  sum  is  invested  at  26% 
 p.a,  interest  compounded  annually.  In 
 how many years (approx) will it double? 
 SSC CHSL 01/06/2022 (Morning) 
 (a) 4  (b) 3  (c) 2  (d) 5 
 Q.17.  Divide  ?66,300  between  A  and  B  in 
 such  a  way  that  the  amount  that  A 
 receives  after  8  years  is  equal  to  the 
 amount  that  B  receives  after  10  years; 
 with  compound  interest  being 
 compounded  annually  at  a  rate  of  10% 
 per annum. 
 SSC CGL 20/04/2022 (Evening) 
 (a) A = ?35,520, B = ?30,810 
 (b) A = ?35,200, B = ?31,100 
 (c) A = ?37,000, B = ?29,300 
 (d) A = ?36,300, B = ?30,000 
 Q.18.  A  certain  sum  was  invested  for 
 three  years  in  a  scheme  in  which  the 
 interest  gets  compounded  annually. 
 During  the  ?rst  two  years,  the  scheme 
 provided  growth  at  the  rates  of  80%  and 
 60%,  respectively,  but  during  the  third 
 year  there  was  a  decline  by  40%.  What 
 was  the  overall  interest  rate  for  three 
 years ? 
 SSC MTS 12/10/2021 (Afternoon) 
 (a) 24%  (b) 20%  (c) 22.5%  (d) 48.6% 
 Q.19.  A  sum  of  ?5,760  amounts  to 
 ?7,200  in  4  years  and  to  ?x  in  12  years  at 
 a  certain  rate  percent  per  annum,  when 
 the  interest  is  compounded  yearly  in  both 
 the cases. What is the value of x? 
 SSC MTS 06/10/2021 (Evening) 
 (a) 11500 (b) 11250 (c) 12500 (d) 12250 
 Q.20.  Atul  borrowed  a  sum  of  Rs.  12000 
 and  agreed  to  repay  it  by  paying  Rs.  4800 
 at  the  end  of  ?rst  year  and  Rs.  9240  at 
 the  end  of  second  year.  What  is  the  rate 
 of  compound  interest  compounded 
 annually ? 
 SSC CGL 24/08/2021 (Afternoon) 
 (a) 10 %    (b) 12 %   (c)  %     (d) 8 % 
 8 
 5 
 Q.21.  A  and  B  together  borrowed  a  sum 
 of  ?  51,750  at  an  interest  rate  of  7%  p.a. 
 compound  interest  in  such  a  way  that  to 
 settle  the  loan,  A  paid  as  much  amount 
 after  three  years  as  paid  by  B  after  4 
 years  from  the  day  of  borrowing.  The 
 sum (in ?) borrowed by A was: 
 SSC CGL 05/03/2020 (Afternoon) 
 (a) 25,000              (b) 25,650 
 (c) 24,860              (d) 26,750 
 Q.22.  A  certain  loan  was  returned  in  two 
 equal  half  yearly  installments  each  of  Rs 
 6,760.  If  the  rate  of  interest  was  8%  p.a., 
 compounded  yearly,  how  much  was  the 
 interest paid on the loan? 
 SSC CGL Tier II (13/09/2019) 
 (a) ? 750  (b) ? 810  (c) ? 790   (d) ? 770 
 Q.23.  A  certain  sum  amounts  to  Rs 
 4,205.55  at  15%  p.a.  In  2  years,  interest 
 2 
 5 
 compounded yearly. The sum (in ? ) is: 
 SSC CGL Tier II (13/09/2019) 
 (a) 3,200 (b) 3,500 (c) 2,700 (d) 3,000 
 Q.24.  A loan has to be returned in two 
 equal  yearly  installments  each  of  Rs 
 44,100.  If  the  rate  of  interest  is  5%  p.a., 
 compounded annually, then the total 
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Page 3


 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 Compound Interest 
 Key - Points: 
 1.  For  one  year  or  one  term  simple 
 interest  and  compound  interest  are  the 
 same. 
 2.  In  simple  interest  you  divide  the  simple 
 interest  by  the  number  of  years  to 
 calculate  one  year  interest  but  in 
 compound interest this is not applicable. 
 3.  Compound  Interest  is  the  interest  on 
 amount  (principal  +  Interest);  Symbol  we 
 will use ‘CI’. 
 Let  us  say  one  person  borrows  Rs.100 
 for  3  years  at  the  rate  of  10%  annually. 
 What  amount  should  he  have  to  return 
 after 3 years? 
 Here  is  the  approximation  technique  to 
 solve this problem: 
 Compound interest will be = 
 133.10 – 100 = 33.1 Rs. 
 The  above  concept  can  also  be  written 
 as: 
 Amount =  =133.10 
 100     ×     110     ×     110     ×     110 
 100     ×     100     ×     100 
 CI = Amount – Principal 
 CI = 133.10 – 100 = 33.10 
 Or,  Amount = Principal (1 +  ) 
 t 
 ?? 
 100 
 = 100 (1 +  ) 
 3 
 10 
 100 
= 100  × 
 11 
 10 
×
 11 
 10 
×
 11 
 10 
= 133 . 10 
 CI = 33.10 
 So  all  the  above  concepts  have  the  same 
 result,  but  if  you  want  to  solve  questions 
 quickly  and  without  using  formulas  then 
 it  is  advised  to  develop  mastery  on 
 approximation technique. 
 Note  :  Notice  that  in  CI,  interest  is 
 calculated  on  the  amount  at  the  end  of 
 every  year  while  in  SI  interest  for  each 
 year  is  calculated  on  the  Principal 
 amount. 
 4.  If  rate  of  interest  is  different  for 
 different  year,  let  us  say  10%  for  1 
 st 
 year, 
 20%  for  2 
 nd 
 year,  and  30%  for  3 
 rd 
 year 
 then  amount  will  be  calculated  as 
 follows: 
 We  can  also  do  it  as:  Amount  = 
 100     ×        110     ×     120     ×     130 
 100     ×     100     ×     100 
= 171 . 60     ???? .
 Important formulas : 
 Amount = A 
 Principal = P 
 Compound Interest = CI 
 Rate of interest = R 
 Time = no. of cycles = n 
 1.  CI = Amount - Principal 
 2.  When interest is compounded 
 annually : 
 A (in CI) = P  ) 
 n 
( 1 +
 ?? 
 100 
 3.  When interest is compounded 
 half-yearly : 
 A (in CI) = P  ) 
 2n 
( 1 +
 ??  /2 
 100 
 4.  When interest is compounded 
 quarterly : 
 A (in CI) = P  ) 
 4n 
( 1 +
 ??  /4 
 100 
 5.  When interest is compounded 
 monthly : 
 A (in CI) = P  ) 
 12n 
( 1 +
 ??  /12 
 100 
 6.  When the interest is compounded 
 annually and time period is given in 
 fraction, say for 3  years:- 
 2 
 5 
 A (in CI) = P  ) 
 3 
( 1 +
 ?? 
 100 
× ( 1 +
 2 
 5 
 ?? 
 100 
)
 7.  When  different  interest  rates  for 
 different  years  are  given,  say  ,  ,  ?? 
 1 
 %  ?? 
 2 
 % 
 ,  and  for  1st,  2nd,  3rd  and  4th  ?? 
 3 
 %  ?? 
 4 
 % 
 year  respectively : 
 A (in CI) = P  )  (  ) ( 1 +
 ?? 
 1 
 100 
× 1 +
 ?? 
 2 
 100 
×
 (  )  (  )  1 +
 ?? 
 3 
 100 
× 1 +
 ?? 
 4 
 100 
 8.  Equated  monthly  instalment  (EMI) 
 concept : 
 Amount borrowed = 
 ?? 
( 1    +   
 ?? 
 100 
)
 ?? 
 where  = Instalment (EMI)  ?? 
 Example  :  Find  the  amount  which  is 
 needed  to  be  paid  each  year  to  clear  the 
 debt  of  ?2,10,000  in  2  years  at  10% 
 interest rate. 
 Solution  : 
 210000 =  + 
 ?? 
( 1    +   
 10 
 100 
)
 2 
   
 ?? 
( 1    +   
 10 
 100 
)
 210000 =  + 
 ?? 
(
 11 
 10 
)
 2 
 ?? 
   (
 11 
 10 
)
 210000 =  + ?
 100  ?? 
 121 
 10  ?? 
    11 
 210000 = ?
 100  ??    +    110  ?? 
 121 
 210000 =  = ?1,21,000 ?
 210  ?? 
 121 
? ?? 
 9.  When the interest is compounded 8 
 monthly, time period is 2 years and the 
 interest rate is 12% p.a., then 
 For  12  months,  interest  rate  =  12%,  so  for 
 8 months, interest rate =  = 8% 
 8    ×    12 
 12 
 Here, time period = 2 years = 24 months 
 So,  =  3  ,  so  we  need  to  conduct  3 
 24 
 8 
 cycles  each  of  interest  rate  8%  in  order  to 
 calculate required CI. 
 10.  Effective  C.I.  rate  for  two  interest 
 rates  =  (a  +  b  +  )%,  where  a  and  b 
 ???? 
 100 
 are interest rates. 
 11.  Effective  C.I.  rate  for  three  interest 
 rates = 
 (a  +  b  +  c  +  +  )% 
 ????    +    ????    +    ???? 
 100 
 ?????? 
 10000 
 where a, b and c are interest rates. 
 12. Effective rates :- 
 Years ?
 Rate ?
 2nd  3rd  4th 
 5%  10.25%  15.7625%  21.550625% 
 10%  21%  33.1%  46.41% 
 20%  44%  72.8%  107.36% 
 Variety Questions 
 Q.1.  The  compound  interest  on  ?10,000 
 at  20%  per  annum  is  ?4,641.  If 
 compounded  half  yearly,  for  how  many 
 years was the principal invested? 
 SSC CGL Tier II  (26/10/2023) 
 (a) 4  (b) 6  (c) 3  (d) 2 
 Q.2.  Jonathan  had  borrowed  a  sum  of 
 money  3  years  ago  at  10%  interest  per 
 annum  compounded  annually  for  a 
 5-year  period,  with  the  amount  to  be  paid 
 at  the  end  of  the  period  being  ?1,61,051. 
 However,  there  is  no  prepayment  penalty 
 and  Jonathan  has  received  some  bonus 
 payment  now,  with  which  he  has  decided 
 to  clear  his  debt.  How  much  does 
 Jonathan  have  to  pay  now  to  clear  his 
 debt? 
 SSC CPO 03/10/2023 (1st Shift) 
 (a) ?1,33,100  (b) ?1,33,200 
 (c) ?1,33,000  (d) ?1,32,900 
 Q.3.  Money  is  doubled  in  a  bank  account 
 in  7  years,  when  the  Interest  is 
 compounded  annually:  What  time  in 
 years  is  needed  to  make  an  amount  8 
 times in the bank? 
 SSC MTS 14/09/2023 (2nd Shift) 
 (a) 21  (b) 14  (c) 35  (d) 28 
 Q.4.  A  bank  offers  compound  interest  at 
 the  rate  5%  per  annum  calculated  half 
 yearly  on  its  deposits.  A  customer 
 deposits  ?2,400  each  on  1st  January 
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 and  1st  July  of  a  year.  Find  the  amount 
 he received at the end of the year. 
 SSC MTS 12/09/2023 (2nd Shift) 
 (a)  180.50  (b)  4,981.50  ?  ? 
 (c)  181.50  (d)  4,081.50  ?  ? 
 Q.5.  What  will  be  the  present  value  of 
 ?13,230  due  two  years  hence,  when  the 
 interest  is  compounded  at  the  rate  of  5% 
 per annum ? 
 SSC CHSL 07/08/2023 (1st Shift) 
 (a) ?13,000  (b) ?10,500 
 (c) ?11,500  (d) ?12,000 
 Q.6.  If  the  difference  between  the 
 compound  interest  and  simple  interest 
 on  a  certain  sum  of  money  for  3  years  at 
 the  rate  of  4%  per  annum  is  76,  then  ? 
 what is the sum ? 
 SSC CHSL 04/08/2023 (1st Shift) 
 (a)  16,725  (b)  12,925  ?  ? 
 (c)  15,625  (d)  18,825  ?  ? 
 Q.7.  A  sum  amounts  to  ?6,120  in  2  years 
 and  ?7,340  in  3  years  at  compound 
 interest.  The  sum  (in  ?)  is  (rounded  off  to 
 2 decimal places): 
 SSC CHSL 03/08/2023 (2nd Shift) 
 (a) 4,050.13  (b) 4,254.63 
 (c) 4,850.32  (d) 4,560.23 
 Q.8.  A  certain  amount  of  money  was  lent 
 for  a  period  of  1  year  9  months  at  a  rate 
 of  10%  per  annum  compounded  annually. 
 If  the  compound  interest  is  ?1,460,  ?nd 
 the amount of money lent. 
 SSC CHSL 02/08/2023 (1st Shift) 
 (a) ?8,200  (b) ?7,500 
 (c) ?6,000  (d) ?8,000 
 Q.9.  Rs.  2400  is  lent  at  the  rate  of  10 
 percent  per  annum.  Which  of  the 
 following statement(s) is/are correct? 
 I.  The  compound  interest  (compounding 
 annually) for 3 years is Rs. 794.4. 
 II.  The  difference  between  simple  interest 
 and  compound  interest  (compounding 
 annually) after 3 years is Rs. 75.8 
 SSC MTS 18/05/2023 (Afternoon) 
 (a) None of the statements are correct 
 (b) Only statement I is correct 
 (c) Only statement II is correct 
 (d) Both statement I and II are correct 
 Q.10.  The  difference  between  compound 
 interest  and  simple  interest  on  Rs.  x  at 
 25%  per  annum  for  2  years  is  Rs.  325. 
 Find the value of x. 
 SSC MTS 10/05/2023 (Afternoon) 
 (a) Rs. 5200  (b) Rs. 4000 
 (c) Rs. 5300  (d) Rs. 2400 
 Q.11.  Rs.  6000  is  lent  at  the  annual  rate 
 of  10  percent  for  2  years.  Which  of  the 
 following is statement(s) is/are correct ? 
 I. Simple interest to be received on this 
 sum is Rs. 1200 
 II.  Compound  Interest  (compounding 
 annually)  to  be  received  on  this  sum  is 
 Rs. 1260 
 SSC CHSL 10/03/2023 (2nd Shift) 
 (a) Statement I is correct 
 (b) Both statement I and II are correct 
 (c) Statement II is correct 
 (d) None of them are correct. 
 Q.12.  A  man  borrowed  Rs.50,000  from  a 
 bank  at  10%  per  annum,  compounded 
 annually.  At  the  end  of  every  year,  he 
 pays  Rs.15,000  as  part  payment  of  the 
 loan  and  interest.  How  much  does  he  still 
 owe  to  the  bank  after  three  such 
 installments ? 
 SSC CPO 10/11/2022 (Morning) 
 (a) Rs.16,900  (b) Rs.15,800 
 (c) Rs.15,200  (d) Rs.16,200 
 Q.13.  Vipul  and  Manish  invested  the  sum 
 of  15000  and  20000  at  the  rate  of  20  ?  ? 
 percent  p.a.  and  30  percent  p.a. 
 respectively  on  compound  interest 
 (compounding  annually).  If  the  time 
 period  is  3  years  for  both,  then  what  will 
 be  the  total  compound  interest  earned  by 
 Vipul and Manish ? 
 SSC CGL Tier II (08/08/2022) 
 (a)  32480  (b)  31688  ?  ?    
 (c)  29460  (d)  34860  ?  ? 
 Q.14.  A  person  invests  Rs  55,000  for  two 
 years  on  compound  interest  such  that 
 the  rate  of  interest  for  the  ?rst  year  is  8% 
 per  annum  and  that  for  the  second  year 
 is  12%  per  annum,  and  the  interest  is 
 compounded  annually.  What  is  the  total 
 interest earned by the person ? 
 SSC MTS 20/07/2022 (Evening) 
 (a) Rs 11,645  (b) Rs 11,528 
 (c) Rs 12,386  (d) Rs 10,847 
 Q.15.  In  what  time  will  ?3,90,625  amount 
 to  ?4,56,976  at  8%  per  annum,  interest 
 being compounded half-yearly? 
 SSC CHSL 08/06/2022 (Afternoon) 
 (a) 2 years  (b)  years  1 
 1 
 2 
 (c)  years  (d) 1 years  2 
 1 
 2 
 Q.16.  A  certain  sum  is  invested  at  26% 
 p.a,  interest  compounded  annually.  In 
 how many years (approx) will it double? 
 SSC CHSL 01/06/2022 (Morning) 
 (a) 4  (b) 3  (c) 2  (d) 5 
 Q.17.  Divide  ?66,300  between  A  and  B  in 
 such  a  way  that  the  amount  that  A 
 receives  after  8  years  is  equal  to  the 
 amount  that  B  receives  after  10  years; 
 with  compound  interest  being 
 compounded  annually  at  a  rate  of  10% 
 per annum. 
 SSC CGL 20/04/2022 (Evening) 
 (a) A = ?35,520, B = ?30,810 
 (b) A = ?35,200, B = ?31,100 
 (c) A = ?37,000, B = ?29,300 
 (d) A = ?36,300, B = ?30,000 
 Q.18.  A  certain  sum  was  invested  for 
 three  years  in  a  scheme  in  which  the 
 interest  gets  compounded  annually. 
 During  the  ?rst  two  years,  the  scheme 
 provided  growth  at  the  rates  of  80%  and 
 60%,  respectively,  but  during  the  third 
 year  there  was  a  decline  by  40%.  What 
 was  the  overall  interest  rate  for  three 
 years ? 
 SSC MTS 12/10/2021 (Afternoon) 
 (a) 24%  (b) 20%  (c) 22.5%  (d) 48.6% 
 Q.19.  A  sum  of  ?5,760  amounts  to 
 ?7,200  in  4  years  and  to  ?x  in  12  years  at 
 a  certain  rate  percent  per  annum,  when 
 the  interest  is  compounded  yearly  in  both 
 the cases. What is the value of x? 
 SSC MTS 06/10/2021 (Evening) 
 (a) 11500 (b) 11250 (c) 12500 (d) 12250 
 Q.20.  Atul  borrowed  a  sum  of  Rs.  12000 
 and  agreed  to  repay  it  by  paying  Rs.  4800 
 at  the  end  of  ?rst  year  and  Rs.  9240  at 
 the  end  of  second  year.  What  is  the  rate 
 of  compound  interest  compounded 
 annually ? 
 SSC CGL 24/08/2021 (Afternoon) 
 (a) 10 %    (b) 12 %   (c)  %     (d) 8 % 
 8 
 5 
 Q.21.  A  and  B  together  borrowed  a  sum 
 of  ?  51,750  at  an  interest  rate  of  7%  p.a. 
 compound  interest  in  such  a  way  that  to 
 settle  the  loan,  A  paid  as  much  amount 
 after  three  years  as  paid  by  B  after  4 
 years  from  the  day  of  borrowing.  The 
 sum (in ?) borrowed by A was: 
 SSC CGL 05/03/2020 (Afternoon) 
 (a) 25,000              (b) 25,650 
 (c) 24,860              (d) 26,750 
 Q.22.  A  certain  loan  was  returned  in  two 
 equal  half  yearly  installments  each  of  Rs 
 6,760.  If  the  rate  of  interest  was  8%  p.a., 
 compounded  yearly,  how  much  was  the 
 interest paid on the loan? 
 SSC CGL Tier II (13/09/2019) 
 (a) ? 750  (b) ? 810  (c) ? 790   (d) ? 770 
 Q.23.  A  certain  sum  amounts  to  Rs 
 4,205.55  at  15%  p.a.  In  2  years,  interest 
 2 
 5 
 compounded yearly. The sum (in ? ) is: 
 SSC CGL Tier II (13/09/2019) 
 (a) 3,200 (b) 3,500 (c) 2,700 (d) 3,000 
 Q.24.  A loan has to be returned in two 
 equal  yearly  installments  each  of  Rs 
 44,100.  If  the  rate  of  interest  is  5%  p.a., 
 compounded annually, then the total 
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 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 interest paid is: 
 SSC CGL Tier II (12/09/2019) 
 (a) ?5840 (b) ?6000 (c) ?6200 (d) ?6280 
 Q.25.  A  sum  of  Rs  18000  is  lent  at  10% 
 p.a.  compound  interest,  compounded 
 annually.  What  is  the  difference 
 between  the  compound  interest  for  3rd 
 year and 4th year? 
 SSC CGL Tier II (11/09/2019) 
 (a) Rs 220.60           (b) Rs 217.80 
 (c) Rs 221.80           (d) Rs 215.40 
 Q.26  .  What  will  be  the  compound  interest 
 on  a  sum  of  Rs  31,250  for  2  years  at  12% 
 p.a.,  if  the  interest  is  compounded 
 8-monthly? 
 SSC CGL Tier II (11/09/2019) 
 (a) ?8106 (b) ?8116 (c) ?8016 (d) ?8156 
 Q.27.  If  the  compound  interest  in  the 
 third  year  at  8%  p.a.  on  a  certain  sum  is 
 Rs  3600,  then  what  is  the  difference 
 between  the  compound  interest  in  the 
 4th  and  5th  year?  (nearest  to  an  integer 
 in Rs) 
 SSC MTS 22/08/2019 (Evening) 
 (a) ? 304  (b) ? 335   (c) ? 288  (d) ?  311 
 Q.28.  What  is  the  present  value  of  Rs. 
 14739  payable  in  3  years  at  the  rate  of 
 6.25% yearly compound interest ? 
 SSC MTS 21/08/2019 (Evening) 
 (a) Rs 12184  (b) Rs 12288 
 (c) Rs 12473  (d) Rs 12148 
 Q.29.  If  the  rate  of  interest  is  20%  per 
 annum,  compounded  yearly  and  the 
 interest  on  a  certain  sum  in  the  second 
 year  is  Rs  250,  then  what  will  be  the 
 interest on the same sum in the ?fth year 
 SSC MTS 20/08/2019 (Morning) 
 (a) ? 518  (b) ? 400  (c) ? 360  (d) ? 432 
 Q.30.  A  certain  sum  invested  on 
 compound  interest  (compounded 
 annually)  grows  to  Rs  5040  in  three 
 years.  If  the  rate  of  interest  is  20%  for  the 
 ?rst  year,  40%  for  the  second  and  50%  for 
 the third year, then what is the sum? 
 SSC MTS 07/08/2019 (Morning) 
 (a) ?1210 (b) ?2566 (c) ?1800 (d) ?2000 
 Q.31.  The  simple  interest  on  a  certain 
 sum  at  20%  p.a  for  two  years  is  Rs.  250. 
 What  is  the  compound  interest 
 (compounded  annually)  on  the  same 
 sum at the same rate for the same 
 period? 
 SSC MTS 05/08/2019 (Evening) 
 (a) ? 275  (b) ? 900  (c) ? 550  (d) ? 750 
 Q.32.  A  sum  of  money  becomes  3  times 
 in  10  years  at  the  rate  of  compound 
 interest  (compounded  annually),  In  how 
 many years will it become 81 times? 
 SSC MTS 02/08/2019 (Evening) 
 (a) 40 years  (b) 50 years 
 (c) 35 years  (d) 30 years 
 Q.33.  The  difference  between  the 
 compound  interest  and  the  simple 
 interest  on  a  sum  at  10%  p.a.  for  three 
 years is Rs 155. the sum (in Rs) is: 
 SSC CHSL 11/07/2019 (Afternoon) 
 (a) 5500  (b) 6000  (c) 6600  (d) 5000 
 Q.34.  A  certain  amount  invested  at  a 
 certain  rate,  compounded  annually, 
 grows  to  an  amount  in  ?ve  years,  which 
 is  a  factor  of  1.1881  more  than  to  what  it 
 would  have  grown  in  three  years.  What  is 
 the rate percentage? 
 SSC CHSL 04/07/2019 (Evening) 
 (a) 9  (b) 8.1  (c) 8  (d) 9.2 
 Q.35.  Rs  60000  invested  at  a  certain  rate 
 for  a  certain  even  number  of  years, 
 compounded  annually,  grows  to  Rs 
 63,654.  To  how  much  amount  would  it 
 grow  if  it  is  invested  at  the  same  rate  for 
 half period? 
 SSC CHSL 04/07/2019 (Afternoon) 
 (a) Rs 61800  (b) Rs 61809 
 (c) Rs 61675  (d) Rs 61827 
 Q.36.  A  sum  invested  at  8%  p.a.  amounts 
 to  Rs  20280  at  the  end  of  one  year,  when 
 the  interest  is  compounded  half  yearly. 
 What  will  be  the  simple  interest  on  the 
 same  sum  for  4  years  at  double  the 
 3 
 5 
 earlier rate of interest? 
 SSC CHSL 04/07/2019 (Morning) 
 (a) Rs 13500  (b) Rs 13800 
 (c) Rs 14200  (d) Rs 14500 
 Q.37.  The  simple  interest  on  a  certain 
 sum  for  3  years  at  10%  per  annum  is 
 1 
 2 
 Rs  2,940.  What  will  be  the  compound 
 interest  on  the  same  sum  for  2  years 
 1 
 2 
 at  the  same  rate  when  interest  is 
 compounded yearly (nearest to a rupee)? 
 SSC CHSL 02/07/2019 (Afternoon) 
 (a) 2,272  (b) 2,227   (c) 2,327  (d) 2,372 
 Q.38.  The  difference  between  the 
 compound  interest  and  simple  interest 
 on Rs x at 8% per annum for 2 years is Rs 
 19.20. What is the value of x ? 
 SSC CGL 10/06/2019 (Afternoon) 
 (a) 2,500  (b) 3,200 (c) 2,800 (d) 3,000 
 Q.39.  A  sum  of  Rs  12,000  amounts  to  Rs 
 20,736  in  3  years  at  a  certain  rate  percent 
 per  annum,  interest  compounded 
 annually.  What  will  the  amount  of  the 
 same  sum  be  in  2  years  at  the  same  rate 
 on compound interest ? 
 SSC CGL 10/06/2019 (Morning) 
 (a) Rs 15,640  (b) Rs 17,820 
 (c) Rs 17,280  (d) Rs 14,520 
 Q.40.  A  sum  of  Rs  x  was  borrowed  and 
 paid  back  in  two  equal  yearly 
 installments,  each  of  Rs  35,280.  If  the 
 rate  of  interest  was  5%,  compounded 
 annually, then the value of x is: 
 SSC CGL 07/06/2019 (Afternoon) 
 (a) 64,400  (b) 65,600 
 (c) 64,800              (d) 65,400 
 Q.41.  A  person  borrowed  a  certain  sum 
 at  10%  p.a.  for  three  years,  interest  being 
 compounded  annually.  At  the  end  of  two 
 years,  he  repaid  a  sum  of  Rs.  6634  and  at 
 the  end  of  the  third  year,  he  cleared  off 
 the  debt  by  paying  Rs.  13,200.  What  was 
 the sum borrowed by him ? 
 SSC CGL 06/06/2019 (Evening) 
 (a) Rs. 16,400  (b) Rs. 15,400 
 (c) Rs. 15,600  (d) Rs. 16,500 
 Q.42  .  A  sum  of  Rs  15,000  is  lent  at  16% 
 p.a.  compound  interest.  What  is  the 
 difference  between  the  compound 
 interest  for  the  second  year  and  the  third 
 year ? 
 SSC CGL 06/06/2019 (Morning) 
 (a) Rs 544  (b) Rs 445.44 
 (c) Rs 454.88  (d) Rs 548 
 Q.43.  What will be the compound interest 
 (nearest  to  Rs  1)  on  a  sum  of  Rs  25,000 
 for  2  years  at  12%  p.a.,  if  the  interest  is 
 compounded 8-monthly? 
 SSC CGL 04/06/2019 (Evening) 
 (a) Rs 6,394  (b) Rs 6.439 
 (c) Rs 6,493           (d) Rs 6.349 
 Q.44.  The  compound  interest  on  a 
 certain  sum  in  2  years  at  10%  p.a., 
 1 
 2 
 interest  compounded  yearly,  is  Rs  1,623. 
 The sum is : 
 SSC CGL 04/06/2019 (Afternoon) 
 (a) Rs 5,000  (b) Rs 6,000 
 (c) Rs 6,500           (d) Rs 7,200 
 Q.45.  The  interest  on  Rs  24,000  in  years 
 compounded  annually  when  the  rates  are 
 8%  p.a  and  10%  p.a  for  two  successive 
 years is: 
 SSC CPO 16/03/2019 (Afternoon) 
 (a) ?3994  (b) ?4512  (c) ?5040 (d) ?5866 
 Q.46.  The  annual  interest  compounded 
 on  any  amount  is  Rs  1,320  for  the 
 second  year  and  Rs  1,452  for  the  third 
 year.  What  will  be  the  original  amount  at 
 the beginning of the ?rst year ? 
 SSC CPO 15/03/2019 (Evening) 
 (a) 12,650  (b) 13,200 
 (c) 12,970  (d) 12,000 
 Q.47.  A sum of Rs 18,000 is invested for 
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Page 4


 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 Compound Interest 
 Key - Points: 
 1.  For  one  year  or  one  term  simple 
 interest  and  compound  interest  are  the 
 same. 
 2.  In  simple  interest  you  divide  the  simple 
 interest  by  the  number  of  years  to 
 calculate  one  year  interest  but  in 
 compound interest this is not applicable. 
 3.  Compound  Interest  is  the  interest  on 
 amount  (principal  +  Interest);  Symbol  we 
 will use ‘CI’. 
 Let  us  say  one  person  borrows  Rs.100 
 for  3  years  at  the  rate  of  10%  annually. 
 What  amount  should  he  have  to  return 
 after 3 years? 
 Here  is  the  approximation  technique  to 
 solve this problem: 
 Compound interest will be = 
 133.10 – 100 = 33.1 Rs. 
 The  above  concept  can  also  be  written 
 as: 
 Amount =  =133.10 
 100     ×     110     ×     110     ×     110 
 100     ×     100     ×     100 
 CI = Amount – Principal 
 CI = 133.10 – 100 = 33.10 
 Or,  Amount = Principal (1 +  ) 
 t 
 ?? 
 100 
 = 100 (1 +  ) 
 3 
 10 
 100 
= 100  × 
 11 
 10 
×
 11 
 10 
×
 11 
 10 
= 133 . 10 
 CI = 33.10 
 So  all  the  above  concepts  have  the  same 
 result,  but  if  you  want  to  solve  questions 
 quickly  and  without  using  formulas  then 
 it  is  advised  to  develop  mastery  on 
 approximation technique. 
 Note  :  Notice  that  in  CI,  interest  is 
 calculated  on  the  amount  at  the  end  of 
 every  year  while  in  SI  interest  for  each 
 year  is  calculated  on  the  Principal 
 amount. 
 4.  If  rate  of  interest  is  different  for 
 different  year,  let  us  say  10%  for  1 
 st 
 year, 
 20%  for  2 
 nd 
 year,  and  30%  for  3 
 rd 
 year 
 then  amount  will  be  calculated  as 
 follows: 
 We  can  also  do  it  as:  Amount  = 
 100     ×        110     ×     120     ×     130 
 100     ×     100     ×     100 
= 171 . 60     ???? .
 Important formulas : 
 Amount = A 
 Principal = P 
 Compound Interest = CI 
 Rate of interest = R 
 Time = no. of cycles = n 
 1.  CI = Amount - Principal 
 2.  When interest is compounded 
 annually : 
 A (in CI) = P  ) 
 n 
( 1 +
 ?? 
 100 
 3.  When interest is compounded 
 half-yearly : 
 A (in CI) = P  ) 
 2n 
( 1 +
 ??  /2 
 100 
 4.  When interest is compounded 
 quarterly : 
 A (in CI) = P  ) 
 4n 
( 1 +
 ??  /4 
 100 
 5.  When interest is compounded 
 monthly : 
 A (in CI) = P  ) 
 12n 
( 1 +
 ??  /12 
 100 
 6.  When the interest is compounded 
 annually and time period is given in 
 fraction, say for 3  years:- 
 2 
 5 
 A (in CI) = P  ) 
 3 
( 1 +
 ?? 
 100 
× ( 1 +
 2 
 5 
 ?? 
 100 
)
 7.  When  different  interest  rates  for 
 different  years  are  given,  say  ,  ,  ?? 
 1 
 %  ?? 
 2 
 % 
 ,  and  for  1st,  2nd,  3rd  and  4th  ?? 
 3 
 %  ?? 
 4 
 % 
 year  respectively : 
 A (in CI) = P  )  (  ) ( 1 +
 ?? 
 1 
 100 
× 1 +
 ?? 
 2 
 100 
×
 (  )  (  )  1 +
 ?? 
 3 
 100 
× 1 +
 ?? 
 4 
 100 
 8.  Equated  monthly  instalment  (EMI) 
 concept : 
 Amount borrowed = 
 ?? 
( 1    +   
 ?? 
 100 
)
 ?? 
 where  = Instalment (EMI)  ?? 
 Example  :  Find  the  amount  which  is 
 needed  to  be  paid  each  year  to  clear  the 
 debt  of  ?2,10,000  in  2  years  at  10% 
 interest rate. 
 Solution  : 
 210000 =  + 
 ?? 
( 1    +   
 10 
 100 
)
 2 
   
 ?? 
( 1    +   
 10 
 100 
)
 210000 =  + 
 ?? 
(
 11 
 10 
)
 2 
 ?? 
   (
 11 
 10 
)
 210000 =  + ?
 100  ?? 
 121 
 10  ?? 
    11 
 210000 = ?
 100  ??    +    110  ?? 
 121 
 210000 =  = ?1,21,000 ?
 210  ?? 
 121 
? ?? 
 9.  When the interest is compounded 8 
 monthly, time period is 2 years and the 
 interest rate is 12% p.a., then 
 For  12  months,  interest  rate  =  12%,  so  for 
 8 months, interest rate =  = 8% 
 8    ×    12 
 12 
 Here, time period = 2 years = 24 months 
 So,  =  3  ,  so  we  need  to  conduct  3 
 24 
 8 
 cycles  each  of  interest  rate  8%  in  order  to 
 calculate required CI. 
 10.  Effective  C.I.  rate  for  two  interest 
 rates  =  (a  +  b  +  )%,  where  a  and  b 
 ???? 
 100 
 are interest rates. 
 11.  Effective  C.I.  rate  for  three  interest 
 rates = 
 (a  +  b  +  c  +  +  )% 
 ????    +    ????    +    ???? 
 100 
 ?????? 
 10000 
 where a, b and c are interest rates. 
 12. Effective rates :- 
 Years ?
 Rate ?
 2nd  3rd  4th 
 5%  10.25%  15.7625%  21.550625% 
 10%  21%  33.1%  46.41% 
 20%  44%  72.8%  107.36% 
 Variety Questions 
 Q.1.  The  compound  interest  on  ?10,000 
 at  20%  per  annum  is  ?4,641.  If 
 compounded  half  yearly,  for  how  many 
 years was the principal invested? 
 SSC CGL Tier II  (26/10/2023) 
 (a) 4  (b) 6  (c) 3  (d) 2 
 Q.2.  Jonathan  had  borrowed  a  sum  of 
 money  3  years  ago  at  10%  interest  per 
 annum  compounded  annually  for  a 
 5-year  period,  with  the  amount  to  be  paid 
 at  the  end  of  the  period  being  ?1,61,051. 
 However,  there  is  no  prepayment  penalty 
 and  Jonathan  has  received  some  bonus 
 payment  now,  with  which  he  has  decided 
 to  clear  his  debt.  How  much  does 
 Jonathan  have  to  pay  now  to  clear  his 
 debt? 
 SSC CPO 03/10/2023 (1st Shift) 
 (a) ?1,33,100  (b) ?1,33,200 
 (c) ?1,33,000  (d) ?1,32,900 
 Q.3.  Money  is  doubled  in  a  bank  account 
 in  7  years,  when  the  Interest  is 
 compounded  annually:  What  time  in 
 years  is  needed  to  make  an  amount  8 
 times in the bank? 
 SSC MTS 14/09/2023 (2nd Shift) 
 (a) 21  (b) 14  (c) 35  (d) 28 
 Q.4.  A  bank  offers  compound  interest  at 
 the  rate  5%  per  annum  calculated  half 
 yearly  on  its  deposits.  A  customer 
 deposits  ?2,400  each  on  1st  January 
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 and  1st  July  of  a  year.  Find  the  amount 
 he received at the end of the year. 
 SSC MTS 12/09/2023 (2nd Shift) 
 (a)  180.50  (b)  4,981.50  ?  ? 
 (c)  181.50  (d)  4,081.50  ?  ? 
 Q.5.  What  will  be  the  present  value  of 
 ?13,230  due  two  years  hence,  when  the 
 interest  is  compounded  at  the  rate  of  5% 
 per annum ? 
 SSC CHSL 07/08/2023 (1st Shift) 
 (a) ?13,000  (b) ?10,500 
 (c) ?11,500  (d) ?12,000 
 Q.6.  If  the  difference  between  the 
 compound  interest  and  simple  interest 
 on  a  certain  sum  of  money  for  3  years  at 
 the  rate  of  4%  per  annum  is  76,  then  ? 
 what is the sum ? 
 SSC CHSL 04/08/2023 (1st Shift) 
 (a)  16,725  (b)  12,925  ?  ? 
 (c)  15,625  (d)  18,825  ?  ? 
 Q.7.  A  sum  amounts  to  ?6,120  in  2  years 
 and  ?7,340  in  3  years  at  compound 
 interest.  The  sum  (in  ?)  is  (rounded  off  to 
 2 decimal places): 
 SSC CHSL 03/08/2023 (2nd Shift) 
 (a) 4,050.13  (b) 4,254.63 
 (c) 4,850.32  (d) 4,560.23 
 Q.8.  A  certain  amount  of  money  was  lent 
 for  a  period  of  1  year  9  months  at  a  rate 
 of  10%  per  annum  compounded  annually. 
 If  the  compound  interest  is  ?1,460,  ?nd 
 the amount of money lent. 
 SSC CHSL 02/08/2023 (1st Shift) 
 (a) ?8,200  (b) ?7,500 
 (c) ?6,000  (d) ?8,000 
 Q.9.  Rs.  2400  is  lent  at  the  rate  of  10 
 percent  per  annum.  Which  of  the 
 following statement(s) is/are correct? 
 I.  The  compound  interest  (compounding 
 annually) for 3 years is Rs. 794.4. 
 II.  The  difference  between  simple  interest 
 and  compound  interest  (compounding 
 annually) after 3 years is Rs. 75.8 
 SSC MTS 18/05/2023 (Afternoon) 
 (a) None of the statements are correct 
 (b) Only statement I is correct 
 (c) Only statement II is correct 
 (d) Both statement I and II are correct 
 Q.10.  The  difference  between  compound 
 interest  and  simple  interest  on  Rs.  x  at 
 25%  per  annum  for  2  years  is  Rs.  325. 
 Find the value of x. 
 SSC MTS 10/05/2023 (Afternoon) 
 (a) Rs. 5200  (b) Rs. 4000 
 (c) Rs. 5300  (d) Rs. 2400 
 Q.11.  Rs.  6000  is  lent  at  the  annual  rate 
 of  10  percent  for  2  years.  Which  of  the 
 following is statement(s) is/are correct ? 
 I. Simple interest to be received on this 
 sum is Rs. 1200 
 II.  Compound  Interest  (compounding 
 annually)  to  be  received  on  this  sum  is 
 Rs. 1260 
 SSC CHSL 10/03/2023 (2nd Shift) 
 (a) Statement I is correct 
 (b) Both statement I and II are correct 
 (c) Statement II is correct 
 (d) None of them are correct. 
 Q.12.  A  man  borrowed  Rs.50,000  from  a 
 bank  at  10%  per  annum,  compounded 
 annually.  At  the  end  of  every  year,  he 
 pays  Rs.15,000  as  part  payment  of  the 
 loan  and  interest.  How  much  does  he  still 
 owe  to  the  bank  after  three  such 
 installments ? 
 SSC CPO 10/11/2022 (Morning) 
 (a) Rs.16,900  (b) Rs.15,800 
 (c) Rs.15,200  (d) Rs.16,200 
 Q.13.  Vipul  and  Manish  invested  the  sum 
 of  15000  and  20000  at  the  rate  of  20  ?  ? 
 percent  p.a.  and  30  percent  p.a. 
 respectively  on  compound  interest 
 (compounding  annually).  If  the  time 
 period  is  3  years  for  both,  then  what  will 
 be  the  total  compound  interest  earned  by 
 Vipul and Manish ? 
 SSC CGL Tier II (08/08/2022) 
 (a)  32480  (b)  31688  ?  ?    
 (c)  29460  (d)  34860  ?  ? 
 Q.14.  A  person  invests  Rs  55,000  for  two 
 years  on  compound  interest  such  that 
 the  rate  of  interest  for  the  ?rst  year  is  8% 
 per  annum  and  that  for  the  second  year 
 is  12%  per  annum,  and  the  interest  is 
 compounded  annually.  What  is  the  total 
 interest earned by the person ? 
 SSC MTS 20/07/2022 (Evening) 
 (a) Rs 11,645  (b) Rs 11,528 
 (c) Rs 12,386  (d) Rs 10,847 
 Q.15.  In  what  time  will  ?3,90,625  amount 
 to  ?4,56,976  at  8%  per  annum,  interest 
 being compounded half-yearly? 
 SSC CHSL 08/06/2022 (Afternoon) 
 (a) 2 years  (b)  years  1 
 1 
 2 
 (c)  years  (d) 1 years  2 
 1 
 2 
 Q.16.  A  certain  sum  is  invested  at  26% 
 p.a,  interest  compounded  annually.  In 
 how many years (approx) will it double? 
 SSC CHSL 01/06/2022 (Morning) 
 (a) 4  (b) 3  (c) 2  (d) 5 
 Q.17.  Divide  ?66,300  between  A  and  B  in 
 such  a  way  that  the  amount  that  A 
 receives  after  8  years  is  equal  to  the 
 amount  that  B  receives  after  10  years; 
 with  compound  interest  being 
 compounded  annually  at  a  rate  of  10% 
 per annum. 
 SSC CGL 20/04/2022 (Evening) 
 (a) A = ?35,520, B = ?30,810 
 (b) A = ?35,200, B = ?31,100 
 (c) A = ?37,000, B = ?29,300 
 (d) A = ?36,300, B = ?30,000 
 Q.18.  A  certain  sum  was  invested  for 
 three  years  in  a  scheme  in  which  the 
 interest  gets  compounded  annually. 
 During  the  ?rst  two  years,  the  scheme 
 provided  growth  at  the  rates  of  80%  and 
 60%,  respectively,  but  during  the  third 
 year  there  was  a  decline  by  40%.  What 
 was  the  overall  interest  rate  for  three 
 years ? 
 SSC MTS 12/10/2021 (Afternoon) 
 (a) 24%  (b) 20%  (c) 22.5%  (d) 48.6% 
 Q.19.  A  sum  of  ?5,760  amounts  to 
 ?7,200  in  4  years  and  to  ?x  in  12  years  at 
 a  certain  rate  percent  per  annum,  when 
 the  interest  is  compounded  yearly  in  both 
 the cases. What is the value of x? 
 SSC MTS 06/10/2021 (Evening) 
 (a) 11500 (b) 11250 (c) 12500 (d) 12250 
 Q.20.  Atul  borrowed  a  sum  of  Rs.  12000 
 and  agreed  to  repay  it  by  paying  Rs.  4800 
 at  the  end  of  ?rst  year  and  Rs.  9240  at 
 the  end  of  second  year.  What  is  the  rate 
 of  compound  interest  compounded 
 annually ? 
 SSC CGL 24/08/2021 (Afternoon) 
 (a) 10 %    (b) 12 %   (c)  %     (d) 8 % 
 8 
 5 
 Q.21.  A  and  B  together  borrowed  a  sum 
 of  ?  51,750  at  an  interest  rate  of  7%  p.a. 
 compound  interest  in  such  a  way  that  to 
 settle  the  loan,  A  paid  as  much  amount 
 after  three  years  as  paid  by  B  after  4 
 years  from  the  day  of  borrowing.  The 
 sum (in ?) borrowed by A was: 
 SSC CGL 05/03/2020 (Afternoon) 
 (a) 25,000              (b) 25,650 
 (c) 24,860              (d) 26,750 
 Q.22.  A  certain  loan  was  returned  in  two 
 equal  half  yearly  installments  each  of  Rs 
 6,760.  If  the  rate  of  interest  was  8%  p.a., 
 compounded  yearly,  how  much  was  the 
 interest paid on the loan? 
 SSC CGL Tier II (13/09/2019) 
 (a) ? 750  (b) ? 810  (c) ? 790   (d) ? 770 
 Q.23.  A  certain  sum  amounts  to  Rs 
 4,205.55  at  15%  p.a.  In  2  years,  interest 
 2 
 5 
 compounded yearly. The sum (in ? ) is: 
 SSC CGL Tier II (13/09/2019) 
 (a) 3,200 (b) 3,500 (c) 2,700 (d) 3,000 
 Q.24.  A loan has to be returned in two 
 equal  yearly  installments  each  of  Rs 
 44,100.  If  the  rate  of  interest  is  5%  p.a., 
 compounded annually, then the total 
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 interest paid is: 
 SSC CGL Tier II (12/09/2019) 
 (a) ?5840 (b) ?6000 (c) ?6200 (d) ?6280 
 Q.25.  A  sum  of  Rs  18000  is  lent  at  10% 
 p.a.  compound  interest,  compounded 
 annually.  What  is  the  difference 
 between  the  compound  interest  for  3rd 
 year and 4th year? 
 SSC CGL Tier II (11/09/2019) 
 (a) Rs 220.60           (b) Rs 217.80 
 (c) Rs 221.80           (d) Rs 215.40 
 Q.26  .  What  will  be  the  compound  interest 
 on  a  sum  of  Rs  31,250  for  2  years  at  12% 
 p.a.,  if  the  interest  is  compounded 
 8-monthly? 
 SSC CGL Tier II (11/09/2019) 
 (a) ?8106 (b) ?8116 (c) ?8016 (d) ?8156 
 Q.27.  If  the  compound  interest  in  the 
 third  year  at  8%  p.a.  on  a  certain  sum  is 
 Rs  3600,  then  what  is  the  difference 
 between  the  compound  interest  in  the 
 4th  and  5th  year?  (nearest  to  an  integer 
 in Rs) 
 SSC MTS 22/08/2019 (Evening) 
 (a) ? 304  (b) ? 335   (c) ? 288  (d) ?  311 
 Q.28.  What  is  the  present  value  of  Rs. 
 14739  payable  in  3  years  at  the  rate  of 
 6.25% yearly compound interest ? 
 SSC MTS 21/08/2019 (Evening) 
 (a) Rs 12184  (b) Rs 12288 
 (c) Rs 12473  (d) Rs 12148 
 Q.29.  If  the  rate  of  interest  is  20%  per 
 annum,  compounded  yearly  and  the 
 interest  on  a  certain  sum  in  the  second 
 year  is  Rs  250,  then  what  will  be  the 
 interest on the same sum in the ?fth year 
 SSC MTS 20/08/2019 (Morning) 
 (a) ? 518  (b) ? 400  (c) ? 360  (d) ? 432 
 Q.30.  A  certain  sum  invested  on 
 compound  interest  (compounded 
 annually)  grows  to  Rs  5040  in  three 
 years.  If  the  rate  of  interest  is  20%  for  the 
 ?rst  year,  40%  for  the  second  and  50%  for 
 the third year, then what is the sum? 
 SSC MTS 07/08/2019 (Morning) 
 (a) ?1210 (b) ?2566 (c) ?1800 (d) ?2000 
 Q.31.  The  simple  interest  on  a  certain 
 sum  at  20%  p.a  for  two  years  is  Rs.  250. 
 What  is  the  compound  interest 
 (compounded  annually)  on  the  same 
 sum at the same rate for the same 
 period? 
 SSC MTS 05/08/2019 (Evening) 
 (a) ? 275  (b) ? 900  (c) ? 550  (d) ? 750 
 Q.32.  A  sum  of  money  becomes  3  times 
 in  10  years  at  the  rate  of  compound 
 interest  (compounded  annually),  In  how 
 many years will it become 81 times? 
 SSC MTS 02/08/2019 (Evening) 
 (a) 40 years  (b) 50 years 
 (c) 35 years  (d) 30 years 
 Q.33.  The  difference  between  the 
 compound  interest  and  the  simple 
 interest  on  a  sum  at  10%  p.a.  for  three 
 years is Rs 155. the sum (in Rs) is: 
 SSC CHSL 11/07/2019 (Afternoon) 
 (a) 5500  (b) 6000  (c) 6600  (d) 5000 
 Q.34.  A  certain  amount  invested  at  a 
 certain  rate,  compounded  annually, 
 grows  to  an  amount  in  ?ve  years,  which 
 is  a  factor  of  1.1881  more  than  to  what  it 
 would  have  grown  in  three  years.  What  is 
 the rate percentage? 
 SSC CHSL 04/07/2019 (Evening) 
 (a) 9  (b) 8.1  (c) 8  (d) 9.2 
 Q.35.  Rs  60000  invested  at  a  certain  rate 
 for  a  certain  even  number  of  years, 
 compounded  annually,  grows  to  Rs 
 63,654.  To  how  much  amount  would  it 
 grow  if  it  is  invested  at  the  same  rate  for 
 half period? 
 SSC CHSL 04/07/2019 (Afternoon) 
 (a) Rs 61800  (b) Rs 61809 
 (c) Rs 61675  (d) Rs 61827 
 Q.36.  A  sum  invested  at  8%  p.a.  amounts 
 to  Rs  20280  at  the  end  of  one  year,  when 
 the  interest  is  compounded  half  yearly. 
 What  will  be  the  simple  interest  on  the 
 same  sum  for  4  years  at  double  the 
 3 
 5 
 earlier rate of interest? 
 SSC CHSL 04/07/2019 (Morning) 
 (a) Rs 13500  (b) Rs 13800 
 (c) Rs 14200  (d) Rs 14500 
 Q.37.  The  simple  interest  on  a  certain 
 sum  for  3  years  at  10%  per  annum  is 
 1 
 2 
 Rs  2,940.  What  will  be  the  compound 
 interest  on  the  same  sum  for  2  years 
 1 
 2 
 at  the  same  rate  when  interest  is 
 compounded yearly (nearest to a rupee)? 
 SSC CHSL 02/07/2019 (Afternoon) 
 (a) 2,272  (b) 2,227   (c) 2,327  (d) 2,372 
 Q.38.  The  difference  between  the 
 compound  interest  and  simple  interest 
 on Rs x at 8% per annum for 2 years is Rs 
 19.20. What is the value of x ? 
 SSC CGL 10/06/2019 (Afternoon) 
 (a) 2,500  (b) 3,200 (c) 2,800 (d) 3,000 
 Q.39.  A  sum  of  Rs  12,000  amounts  to  Rs 
 20,736  in  3  years  at  a  certain  rate  percent 
 per  annum,  interest  compounded 
 annually.  What  will  the  amount  of  the 
 same  sum  be  in  2  years  at  the  same  rate 
 on compound interest ? 
 SSC CGL 10/06/2019 (Morning) 
 (a) Rs 15,640  (b) Rs 17,820 
 (c) Rs 17,280  (d) Rs 14,520 
 Q.40.  A  sum  of  Rs  x  was  borrowed  and 
 paid  back  in  two  equal  yearly 
 installments,  each  of  Rs  35,280.  If  the 
 rate  of  interest  was  5%,  compounded 
 annually, then the value of x is: 
 SSC CGL 07/06/2019 (Afternoon) 
 (a) 64,400  (b) 65,600 
 (c) 64,800              (d) 65,400 
 Q.41.  A  person  borrowed  a  certain  sum 
 at  10%  p.a.  for  three  years,  interest  being 
 compounded  annually.  At  the  end  of  two 
 years,  he  repaid  a  sum  of  Rs.  6634  and  at 
 the  end  of  the  third  year,  he  cleared  off 
 the  debt  by  paying  Rs.  13,200.  What  was 
 the sum borrowed by him ? 
 SSC CGL 06/06/2019 (Evening) 
 (a) Rs. 16,400  (b) Rs. 15,400 
 (c) Rs. 15,600  (d) Rs. 16,500 
 Q.42  .  A  sum  of  Rs  15,000  is  lent  at  16% 
 p.a.  compound  interest.  What  is  the 
 difference  between  the  compound 
 interest  for  the  second  year  and  the  third 
 year ? 
 SSC CGL 06/06/2019 (Morning) 
 (a) Rs 544  (b) Rs 445.44 
 (c) Rs 454.88  (d) Rs 548 
 Q.43.  What will be the compound interest 
 (nearest  to  Rs  1)  on  a  sum  of  Rs  25,000 
 for  2  years  at  12%  p.a.,  if  the  interest  is 
 compounded 8-monthly? 
 SSC CGL 04/06/2019 (Evening) 
 (a) Rs 6,394  (b) Rs 6.439 
 (c) Rs 6,493           (d) Rs 6.349 
 Q.44.  The  compound  interest  on  a 
 certain  sum  in  2  years  at  10%  p.a., 
 1 
 2 
 interest  compounded  yearly,  is  Rs  1,623. 
 The sum is : 
 SSC CGL 04/06/2019 (Afternoon) 
 (a) Rs 5,000  (b) Rs 6,000 
 (c) Rs 6,500           (d) Rs 7,200 
 Q.45.  The  interest  on  Rs  24,000  in  years 
 compounded  annually  when  the  rates  are 
 8%  p.a  and  10%  p.a  for  two  successive 
 years is: 
 SSC CPO 16/03/2019 (Afternoon) 
 (a) ?3994  (b) ?4512  (c) ?5040 (d) ?5866 
 Q.46.  The  annual  interest  compounded 
 on  any  amount  is  Rs  1,320  for  the 
 second  year  and  Rs  1,452  for  the  third 
 year.  What  will  be  the  original  amount  at 
 the beginning of the ?rst year ? 
 SSC CPO 15/03/2019 (Evening) 
 (a) 12,650  (b) 13,200 
 (c) 12,970  (d) 12,000 
 Q.47.  A sum of Rs 18,000 is invested for 
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 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 16  months  at  8%  per  annum 
 compounded  half-yearly.  What  is  the 
 percentage gain ? 
 SSC CPO 12/03/2019 (Evening) 
 (a) 9%  (b) 11%  (c) 10%     (d) 12% 
 Practice Questions 
 SSC CHSL 2023 Tier - 2 
 Q.48.  The  compound  interest  of  ?6,000 
 in  two  years,  if  the  rate  of  interest  is  2.5% 
 per  annum  for  the  ?rst  year  and  2%  per 
 annum for the second year, will be: 
 SSC CHSL Tier II  10/01/2024 
 (a) ?273  (b) ?135  (c) ?270  (d) ?240 
 SSC CPO 2023 Tier - 1 
 Q.49.  A  sum  of  ?1,00,000  was  taken  from 
 a  bank  at  the  rate  of  7%  p.a  to  be 
 compounded  annually  for  5  years. 
 Calculate  the  compound  interest. 
 (Closest to a ?) 
 SSC CPO 03/10/2023 (2nd  Shift) 
 (a) ?40,567  (b) ?40,000 
 (c) ?20,963  (d) ?40,255 
 Q.50.  A  sum  of  money  was  invested  at 
 10%  interest  per  year,  compounded 
 half-yearly,  for  18  months.  If  the  amount 
 payable  on  maturity  was  ?64,827,  what 
 was the sum invested ? 
 SSC CPO 04/10/2023 (1st Shift) 
 (a) ?55,600  (b) ?56,500 
 (c) ?56,800  (d) ?56,000 
 Q.51.  Peter  invested  a  certain  sum  of 
 money  in  a  scheme  paying  10%  simple 
 interest  per  annum,  while  Rachel 
 invested  half  of  the  sum  that  Peter 
 invested  in  a  scheme  paying  10%  interest 
 per  annum  compounded  annually.  Also, 
 while  Peter  invested  for  2  years,  Rachel 
 invested  for  3  years.  If  the  difference  in 
 the  interest  earned  by  Peter  and  Rachel 
 was  ?897,  what  was  the  sum  that  Rachel 
 had invested ? 
 SSC CPO 04/10/2023 (2nd Shift) 
 (a) ?12,900  (b) ?13,000 
 (c) ?13,100  (d) ?12,960 
 Q.52.  A  sum  of  money  amounts  to 
 ?1,200  in  2  years  and  becomes  ?1,260  in 
 3 years at compound interest, when 
 interest  is  compounded  annually.  What  is 
 the  rate  of  compound  interest  per 
 annum? 
 SSC CPO 04/10/2023 (3rd Shift) 
 (a) 6%  (b) 3%  (c) 5%  (d) 4% 
 Q.53.  If  interest  be  compounded 
 half-yearly,  then  ?nd  the  compound 
 interest on ?8,000 at 20% p.a. for 1 year. 
 SSC CPO 05/10/2023 (1st Shift) 
 (a) ?1685 (b) ?1680 (c) ?1675 (d) ?1690 
 Q.54.  Find  the  amount  (integral  value 
 only)  if  a  sum  of  ?6,500  is  being 
 borrowed  at  10%  interest  per  annum  for 
 2  years  if  interest  is  compounded  half  - 
 yearly. 
 SSC CPO 05/10/2023 (2nd Shift) 
 (a) ?7900 (b) ?8150 (c) ?8250 (d) ?7650 
 SSC MTS 2023 Tier - 1 
 Q.55.  Geeta  deposited  a  certain  sum  of 
 money  in  her  bank  account  which 
 amounted  to  ?27,783  in  3  years  at  5%  per 
 annum,  the  interest  being  compounded 
 annually. What amount did she deposit? 
 SSC MTS 01/09/2023 (1st Shift) 
 (a) ?25,500  (b) ?25,000 
 (c) ?26,000  (d) ?24,000 
 Q.56.  A sum of money becomes ?6,400 
 in  3  years  and  ?8,100  in  5  years  on 
 compound  interest  compounded 
 annually.  Find  the  rate  of  interest  per 
 annum. 
 SSC MTS 01/09/2023 (2nd Shift) 
 (a) 12  (b) 12  (c) 12  (d) 12 
 3 
 8 
 4 
 8 
 6 
 8 
 5 
 8 
 Q.57.  The  difference  in  interests  earned 
 on  ?1,50,000  at  an  8%  rate  of  interest  per 
 annum  in  a  year  when  the  interest  in 
 compounded  semi-annually  and  annually, 
 respectively, is ? ______. 
 SSC MTS 01/09/2023 (3rd Shift) 
 (a) 360  (b) 120  (c) 240  (d) 420 
 Q.58.  At  what  rate  of  interest  per  annum, 
 compounded  annually,  will  an  amount  of 
 ?8,000  yield  a  compound  interest  of 
 ?904.2 in 2 years ? 
 SSC MTS 04/09/2023 (1st Shift) 
 (a) 6%  (b) 8%  (c) 10%  (d) 5.5% 
 Q.59.  Find  the  compound  interest 
 (Compounded  annually)  on  ?2,000  for  2 
 years at 10% per annum. 
 1 
 2 
 SSC MTS 04/09/2023 (2nd Shift) 
 (a) ? 561  (b) ? 500  (c) ? 521  (d) ? 541 
 Q.60.  The difference between the 
 compound  interest  (Compounded 
 annually)  and  simple  interest  for  an 
 amount  of  ?85,000  in  2  years  is  ?850. 
 Find the rate of interest per annum. 
 SSC MTS 04/09/2023 (3rd Shift) 
 (a) 5%  (b) 10%  (c) 8%  (d) 12% 
 Q.61.  ?1,250  at  12%  per  annum 
 compounded annually will amount to 
 ?1,568 in: 
 SSC MTS 05/09/2023 (1st Shift) 
 (a) 4 yrs  (b) 1 yr  (c) 2 yrs  (d) 3 yrs 
 Q.62.  Find the amount of ?75,000 for one 
 year  at  the  rate  of  16%  per  annum,  if  the 
 interest  is  compounded  quarterly. 
 (rounded off to two decimal places) 
 SSC MTS 05/09/2023 (2nd Shift) 
 (a) ?87,379.40  (b) ?89,773.40 
 (c) ?87,937.40  (d) ?87,739.40 
 Q.63.  In  how  many  years  will  a  sum  of 
 ?18,000  at  20%  per  annum  compounded 
 half yearly becomes  ? 23,958 ? 
 SSC MTS 05/09/2023 (3rd Shift) 
 (a) 1  (b) 3  (c) 1  (d) 2 
 1 
 2 
 1 
 2 
 1 
 4 
 1 
 2 
 Q.64.  What  is  the  difference  between  the 
 compound  interest,  interest  compounded 
 half  yearly  on  ?72,000  for  1.5  years  at 
 10%  per  annum  and  its  simple  interest 
 for 3 years at 5% per annum? 
 SSC MTS 06/09/2023 (1st Shift) 
 (a) ?559  (b) ?549  (c) ?540  (d) ?449 
 Q.65.  At  what  rate  per  annum  will  a  sum 
 of  ?6,400  fetch  a  compound  interest 
 (Compounded  annually)  of  ?1,344  in  2 
 years? 
 SSC MTS 06/09/2023 (2nd Shift) 
 (a) 10%  (b) 8%  (c) 12%  (d) 5% 
 Q.66.  What  sum  of  money  invested  at  8% 
 per  annum  in  1  years,  compounded 
 1 
 2 
 half-yearly, shall become ?17,576 ? 
 SSC MTS 06/09/2023 (3rd Shift) 
 (a) ?16,500  (b) ?15,000 
 (c) ?15,525  (d) ?15,625 
 Q.67.  A  deposited  ?62,500  at  the  rate  of 
 8%  per  annum  compounded  half  yearly, 
 then  what  is  the  compound  interest  at 
 the end of two years? 
 SSC MTS 08/09/2023 (1st Shift) 
 (a) ?18,161.12  (b) ?12,171.72 
 (c) ?10,821.18  (d) ?10,616.16 
 Q.68.  Find  the  amount  if  ?10,200  is 
 invested  at  the  rate  of  8%  per  annum 
 compound  interest  for  1  years  when 
 1 
 2 
 interest is compounded half yearly (up to 
 two decimal places). 
 SSC MTS 08/09/2023 (2nd Shift) 
 (a) ?11,743.61  (b) ?11,473.61 
 (c) ?11,764.28  (d) ?11,347.28 
 Q.69.  What  will  be  the  compound  interest 
 on  ?30,000  at  10%  per  annum  for  1 
 1    
 2    
 years,  when  interest  is  compounded  half- 
 yearly? 
 SSC MTS 08/09/2023 (3rd Shift) 
 (a) ?4,728.75  (b) ?4,800.75 
 (c) ?5,728.75  (d) ?4,928.75 
 Q.70.  An  amount  of  ?2,000  amounts  to 
 ?2,880 in 2 years. What will be the rate of 
 interest if compounded annually ? 
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Page 5


 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 Compound Interest 
 Key - Points: 
 1.  For  one  year  or  one  term  simple 
 interest  and  compound  interest  are  the 
 same. 
 2.  In  simple  interest  you  divide  the  simple 
 interest  by  the  number  of  years  to 
 calculate  one  year  interest  but  in 
 compound interest this is not applicable. 
 3.  Compound  Interest  is  the  interest  on 
 amount  (principal  +  Interest);  Symbol  we 
 will use ‘CI’. 
 Let  us  say  one  person  borrows  Rs.100 
 for  3  years  at  the  rate  of  10%  annually. 
 What  amount  should  he  have  to  return 
 after 3 years? 
 Here  is  the  approximation  technique  to 
 solve this problem: 
 Compound interest will be = 
 133.10 – 100 = 33.1 Rs. 
 The  above  concept  can  also  be  written 
 as: 
 Amount =  =133.10 
 100     ×     110     ×     110     ×     110 
 100     ×     100     ×     100 
 CI = Amount – Principal 
 CI = 133.10 – 100 = 33.10 
 Or,  Amount = Principal (1 +  ) 
 t 
 ?? 
 100 
 = 100 (1 +  ) 
 3 
 10 
 100 
= 100  × 
 11 
 10 
×
 11 
 10 
×
 11 
 10 
= 133 . 10 
 CI = 33.10 
 So  all  the  above  concepts  have  the  same 
 result,  but  if  you  want  to  solve  questions 
 quickly  and  without  using  formulas  then 
 it  is  advised  to  develop  mastery  on 
 approximation technique. 
 Note  :  Notice  that  in  CI,  interest  is 
 calculated  on  the  amount  at  the  end  of 
 every  year  while  in  SI  interest  for  each 
 year  is  calculated  on  the  Principal 
 amount. 
 4.  If  rate  of  interest  is  different  for 
 different  year,  let  us  say  10%  for  1 
 st 
 year, 
 20%  for  2 
 nd 
 year,  and  30%  for  3 
 rd 
 year 
 then  amount  will  be  calculated  as 
 follows: 
 We  can  also  do  it  as:  Amount  = 
 100     ×        110     ×     120     ×     130 
 100     ×     100     ×     100 
= 171 . 60     ???? .
 Important formulas : 
 Amount = A 
 Principal = P 
 Compound Interest = CI 
 Rate of interest = R 
 Time = no. of cycles = n 
 1.  CI = Amount - Principal 
 2.  When interest is compounded 
 annually : 
 A (in CI) = P  ) 
 n 
( 1 +
 ?? 
 100 
 3.  When interest is compounded 
 half-yearly : 
 A (in CI) = P  ) 
 2n 
( 1 +
 ??  /2 
 100 
 4.  When interest is compounded 
 quarterly : 
 A (in CI) = P  ) 
 4n 
( 1 +
 ??  /4 
 100 
 5.  When interest is compounded 
 monthly : 
 A (in CI) = P  ) 
 12n 
( 1 +
 ??  /12 
 100 
 6.  When the interest is compounded 
 annually and time period is given in 
 fraction, say for 3  years:- 
 2 
 5 
 A (in CI) = P  ) 
 3 
( 1 +
 ?? 
 100 
× ( 1 +
 2 
 5 
 ?? 
 100 
)
 7.  When  different  interest  rates  for 
 different  years  are  given,  say  ,  ,  ?? 
 1 
 %  ?? 
 2 
 % 
 ,  and  for  1st,  2nd,  3rd  and  4th  ?? 
 3 
 %  ?? 
 4 
 % 
 year  respectively : 
 A (in CI) = P  )  (  ) ( 1 +
 ?? 
 1 
 100 
× 1 +
 ?? 
 2 
 100 
×
 (  )  (  )  1 +
 ?? 
 3 
 100 
× 1 +
 ?? 
 4 
 100 
 8.  Equated  monthly  instalment  (EMI) 
 concept : 
 Amount borrowed = 
 ?? 
( 1    +   
 ?? 
 100 
)
 ?? 
 where  = Instalment (EMI)  ?? 
 Example  :  Find  the  amount  which  is 
 needed  to  be  paid  each  year  to  clear  the 
 debt  of  ?2,10,000  in  2  years  at  10% 
 interest rate. 
 Solution  : 
 210000 =  + 
 ?? 
( 1    +   
 10 
 100 
)
 2 
   
 ?? 
( 1    +   
 10 
 100 
)
 210000 =  + 
 ?? 
(
 11 
 10 
)
 2 
 ?? 
   (
 11 
 10 
)
 210000 =  + ?
 100  ?? 
 121 
 10  ?? 
    11 
 210000 = ?
 100  ??    +    110  ?? 
 121 
 210000 =  = ?1,21,000 ?
 210  ?? 
 121 
? ?? 
 9.  When the interest is compounded 8 
 monthly, time period is 2 years and the 
 interest rate is 12% p.a., then 
 For  12  months,  interest  rate  =  12%,  so  for 
 8 months, interest rate =  = 8% 
 8    ×    12 
 12 
 Here, time period = 2 years = 24 months 
 So,  =  3  ,  so  we  need  to  conduct  3 
 24 
 8 
 cycles  each  of  interest  rate  8%  in  order  to 
 calculate required CI. 
 10.  Effective  C.I.  rate  for  two  interest 
 rates  =  (a  +  b  +  )%,  where  a  and  b 
 ???? 
 100 
 are interest rates. 
 11.  Effective  C.I.  rate  for  three  interest 
 rates = 
 (a  +  b  +  c  +  +  )% 
 ????    +    ????    +    ???? 
 100 
 ?????? 
 10000 
 where a, b and c are interest rates. 
 12. Effective rates :- 
 Years ?
 Rate ?
 2nd  3rd  4th 
 5%  10.25%  15.7625%  21.550625% 
 10%  21%  33.1%  46.41% 
 20%  44%  72.8%  107.36% 
 Variety Questions 
 Q.1.  The  compound  interest  on  ?10,000 
 at  20%  per  annum  is  ?4,641.  If 
 compounded  half  yearly,  for  how  many 
 years was the principal invested? 
 SSC CGL Tier II  (26/10/2023) 
 (a) 4  (b) 6  (c) 3  (d) 2 
 Q.2.  Jonathan  had  borrowed  a  sum  of 
 money  3  years  ago  at  10%  interest  per 
 annum  compounded  annually  for  a 
 5-year  period,  with  the  amount  to  be  paid 
 at  the  end  of  the  period  being  ?1,61,051. 
 However,  there  is  no  prepayment  penalty 
 and  Jonathan  has  received  some  bonus 
 payment  now,  with  which  he  has  decided 
 to  clear  his  debt.  How  much  does 
 Jonathan  have  to  pay  now  to  clear  his 
 debt? 
 SSC CPO 03/10/2023 (1st Shift) 
 (a) ?1,33,100  (b) ?1,33,200 
 (c) ?1,33,000  (d) ?1,32,900 
 Q.3.  Money  is  doubled  in  a  bank  account 
 in  7  years,  when  the  Interest  is 
 compounded  annually:  What  time  in 
 years  is  needed  to  make  an  amount  8 
 times in the bank? 
 SSC MTS 14/09/2023 (2nd Shift) 
 (a) 21  (b) 14  (c) 35  (d) 28 
 Q.4.  A  bank  offers  compound  interest  at 
 the  rate  5%  per  annum  calculated  half 
 yearly  on  its  deposits.  A  customer 
 deposits  ?2,400  each  on  1st  January 
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 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 and  1st  July  of  a  year.  Find  the  amount 
 he received at the end of the year. 
 SSC MTS 12/09/2023 (2nd Shift) 
 (a)  180.50  (b)  4,981.50  ?  ? 
 (c)  181.50  (d)  4,081.50  ?  ? 
 Q.5.  What  will  be  the  present  value  of 
 ?13,230  due  two  years  hence,  when  the 
 interest  is  compounded  at  the  rate  of  5% 
 per annum ? 
 SSC CHSL 07/08/2023 (1st Shift) 
 (a) ?13,000  (b) ?10,500 
 (c) ?11,500  (d) ?12,000 
 Q.6.  If  the  difference  between  the 
 compound  interest  and  simple  interest 
 on  a  certain  sum  of  money  for  3  years  at 
 the  rate  of  4%  per  annum  is  76,  then  ? 
 what is the sum ? 
 SSC CHSL 04/08/2023 (1st Shift) 
 (a)  16,725  (b)  12,925  ?  ? 
 (c)  15,625  (d)  18,825  ?  ? 
 Q.7.  A  sum  amounts  to  ?6,120  in  2  years 
 and  ?7,340  in  3  years  at  compound 
 interest.  The  sum  (in  ?)  is  (rounded  off  to 
 2 decimal places): 
 SSC CHSL 03/08/2023 (2nd Shift) 
 (a) 4,050.13  (b) 4,254.63 
 (c) 4,850.32  (d) 4,560.23 
 Q.8.  A  certain  amount  of  money  was  lent 
 for  a  period  of  1  year  9  months  at  a  rate 
 of  10%  per  annum  compounded  annually. 
 If  the  compound  interest  is  ?1,460,  ?nd 
 the amount of money lent. 
 SSC CHSL 02/08/2023 (1st Shift) 
 (a) ?8,200  (b) ?7,500 
 (c) ?6,000  (d) ?8,000 
 Q.9.  Rs.  2400  is  lent  at  the  rate  of  10 
 percent  per  annum.  Which  of  the 
 following statement(s) is/are correct? 
 I.  The  compound  interest  (compounding 
 annually) for 3 years is Rs. 794.4. 
 II.  The  difference  between  simple  interest 
 and  compound  interest  (compounding 
 annually) after 3 years is Rs. 75.8 
 SSC MTS 18/05/2023 (Afternoon) 
 (a) None of the statements are correct 
 (b) Only statement I is correct 
 (c) Only statement II is correct 
 (d) Both statement I and II are correct 
 Q.10.  The  difference  between  compound 
 interest  and  simple  interest  on  Rs.  x  at 
 25%  per  annum  for  2  years  is  Rs.  325. 
 Find the value of x. 
 SSC MTS 10/05/2023 (Afternoon) 
 (a) Rs. 5200  (b) Rs. 4000 
 (c) Rs. 5300  (d) Rs. 2400 
 Q.11.  Rs.  6000  is  lent  at  the  annual  rate 
 of  10  percent  for  2  years.  Which  of  the 
 following is statement(s) is/are correct ? 
 I. Simple interest to be received on this 
 sum is Rs. 1200 
 II.  Compound  Interest  (compounding 
 annually)  to  be  received  on  this  sum  is 
 Rs. 1260 
 SSC CHSL 10/03/2023 (2nd Shift) 
 (a) Statement I is correct 
 (b) Both statement I and II are correct 
 (c) Statement II is correct 
 (d) None of them are correct. 
 Q.12.  A  man  borrowed  Rs.50,000  from  a 
 bank  at  10%  per  annum,  compounded 
 annually.  At  the  end  of  every  year,  he 
 pays  Rs.15,000  as  part  payment  of  the 
 loan  and  interest.  How  much  does  he  still 
 owe  to  the  bank  after  three  such 
 installments ? 
 SSC CPO 10/11/2022 (Morning) 
 (a) Rs.16,900  (b) Rs.15,800 
 (c) Rs.15,200  (d) Rs.16,200 
 Q.13.  Vipul  and  Manish  invested  the  sum 
 of  15000  and  20000  at  the  rate  of  20  ?  ? 
 percent  p.a.  and  30  percent  p.a. 
 respectively  on  compound  interest 
 (compounding  annually).  If  the  time 
 period  is  3  years  for  both,  then  what  will 
 be  the  total  compound  interest  earned  by 
 Vipul and Manish ? 
 SSC CGL Tier II (08/08/2022) 
 (a)  32480  (b)  31688  ?  ?    
 (c)  29460  (d)  34860  ?  ? 
 Q.14.  A  person  invests  Rs  55,000  for  two 
 years  on  compound  interest  such  that 
 the  rate  of  interest  for  the  ?rst  year  is  8% 
 per  annum  and  that  for  the  second  year 
 is  12%  per  annum,  and  the  interest  is 
 compounded  annually.  What  is  the  total 
 interest earned by the person ? 
 SSC MTS 20/07/2022 (Evening) 
 (a) Rs 11,645  (b) Rs 11,528 
 (c) Rs 12,386  (d) Rs 10,847 
 Q.15.  In  what  time  will  ?3,90,625  amount 
 to  ?4,56,976  at  8%  per  annum,  interest 
 being compounded half-yearly? 
 SSC CHSL 08/06/2022 (Afternoon) 
 (a) 2 years  (b)  years  1 
 1 
 2 
 (c)  years  (d) 1 years  2 
 1 
 2 
 Q.16.  A  certain  sum  is  invested  at  26% 
 p.a,  interest  compounded  annually.  In 
 how many years (approx) will it double? 
 SSC CHSL 01/06/2022 (Morning) 
 (a) 4  (b) 3  (c) 2  (d) 5 
 Q.17.  Divide  ?66,300  between  A  and  B  in 
 such  a  way  that  the  amount  that  A 
 receives  after  8  years  is  equal  to  the 
 amount  that  B  receives  after  10  years; 
 with  compound  interest  being 
 compounded  annually  at  a  rate  of  10% 
 per annum. 
 SSC CGL 20/04/2022 (Evening) 
 (a) A = ?35,520, B = ?30,810 
 (b) A = ?35,200, B = ?31,100 
 (c) A = ?37,000, B = ?29,300 
 (d) A = ?36,300, B = ?30,000 
 Q.18.  A  certain  sum  was  invested  for 
 three  years  in  a  scheme  in  which  the 
 interest  gets  compounded  annually. 
 During  the  ?rst  two  years,  the  scheme 
 provided  growth  at  the  rates  of  80%  and 
 60%,  respectively,  but  during  the  third 
 year  there  was  a  decline  by  40%.  What 
 was  the  overall  interest  rate  for  three 
 years ? 
 SSC MTS 12/10/2021 (Afternoon) 
 (a) 24%  (b) 20%  (c) 22.5%  (d) 48.6% 
 Q.19.  A  sum  of  ?5,760  amounts  to 
 ?7,200  in  4  years  and  to  ?x  in  12  years  at 
 a  certain  rate  percent  per  annum,  when 
 the  interest  is  compounded  yearly  in  both 
 the cases. What is the value of x? 
 SSC MTS 06/10/2021 (Evening) 
 (a) 11500 (b) 11250 (c) 12500 (d) 12250 
 Q.20.  Atul  borrowed  a  sum  of  Rs.  12000 
 and  agreed  to  repay  it  by  paying  Rs.  4800 
 at  the  end  of  ?rst  year  and  Rs.  9240  at 
 the  end  of  second  year.  What  is  the  rate 
 of  compound  interest  compounded 
 annually ? 
 SSC CGL 24/08/2021 (Afternoon) 
 (a) 10 %    (b) 12 %   (c)  %     (d) 8 % 
 8 
 5 
 Q.21.  A  and  B  together  borrowed  a  sum 
 of  ?  51,750  at  an  interest  rate  of  7%  p.a. 
 compound  interest  in  such  a  way  that  to 
 settle  the  loan,  A  paid  as  much  amount 
 after  three  years  as  paid  by  B  after  4 
 years  from  the  day  of  borrowing.  The 
 sum (in ?) borrowed by A was: 
 SSC CGL 05/03/2020 (Afternoon) 
 (a) 25,000              (b) 25,650 
 (c) 24,860              (d) 26,750 
 Q.22.  A  certain  loan  was  returned  in  two 
 equal  half  yearly  installments  each  of  Rs 
 6,760.  If  the  rate  of  interest  was  8%  p.a., 
 compounded  yearly,  how  much  was  the 
 interest paid on the loan? 
 SSC CGL Tier II (13/09/2019) 
 (a) ? 750  (b) ? 810  (c) ? 790   (d) ? 770 
 Q.23.  A  certain  sum  amounts  to  Rs 
 4,205.55  at  15%  p.a.  In  2  years,  interest 
 2 
 5 
 compounded yearly. The sum (in ? ) is: 
 SSC CGL Tier II (13/09/2019) 
 (a) 3,200 (b) 3,500 (c) 2,700 (d) 3,000 
 Q.24.  A loan has to be returned in two 
 equal  yearly  installments  each  of  Rs 
 44,100.  If  the  rate  of  interest  is  5%  p.a., 
 compounded annually, then the total 
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 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 interest paid is: 
 SSC CGL Tier II (12/09/2019) 
 (a) ?5840 (b) ?6000 (c) ?6200 (d) ?6280 
 Q.25.  A  sum  of  Rs  18000  is  lent  at  10% 
 p.a.  compound  interest,  compounded 
 annually.  What  is  the  difference 
 between  the  compound  interest  for  3rd 
 year and 4th year? 
 SSC CGL Tier II (11/09/2019) 
 (a) Rs 220.60           (b) Rs 217.80 
 (c) Rs 221.80           (d) Rs 215.40 
 Q.26  .  What  will  be  the  compound  interest 
 on  a  sum  of  Rs  31,250  for  2  years  at  12% 
 p.a.,  if  the  interest  is  compounded 
 8-monthly? 
 SSC CGL Tier II (11/09/2019) 
 (a) ?8106 (b) ?8116 (c) ?8016 (d) ?8156 
 Q.27.  If  the  compound  interest  in  the 
 third  year  at  8%  p.a.  on  a  certain  sum  is 
 Rs  3600,  then  what  is  the  difference 
 between  the  compound  interest  in  the 
 4th  and  5th  year?  (nearest  to  an  integer 
 in Rs) 
 SSC MTS 22/08/2019 (Evening) 
 (a) ? 304  (b) ? 335   (c) ? 288  (d) ?  311 
 Q.28.  What  is  the  present  value  of  Rs. 
 14739  payable  in  3  years  at  the  rate  of 
 6.25% yearly compound interest ? 
 SSC MTS 21/08/2019 (Evening) 
 (a) Rs 12184  (b) Rs 12288 
 (c) Rs 12473  (d) Rs 12148 
 Q.29.  If  the  rate  of  interest  is  20%  per 
 annum,  compounded  yearly  and  the 
 interest  on  a  certain  sum  in  the  second 
 year  is  Rs  250,  then  what  will  be  the 
 interest on the same sum in the ?fth year 
 SSC MTS 20/08/2019 (Morning) 
 (a) ? 518  (b) ? 400  (c) ? 360  (d) ? 432 
 Q.30.  A  certain  sum  invested  on 
 compound  interest  (compounded 
 annually)  grows  to  Rs  5040  in  three 
 years.  If  the  rate  of  interest  is  20%  for  the 
 ?rst  year,  40%  for  the  second  and  50%  for 
 the third year, then what is the sum? 
 SSC MTS 07/08/2019 (Morning) 
 (a) ?1210 (b) ?2566 (c) ?1800 (d) ?2000 
 Q.31.  The  simple  interest  on  a  certain 
 sum  at  20%  p.a  for  two  years  is  Rs.  250. 
 What  is  the  compound  interest 
 (compounded  annually)  on  the  same 
 sum at the same rate for the same 
 period? 
 SSC MTS 05/08/2019 (Evening) 
 (a) ? 275  (b) ? 900  (c) ? 550  (d) ? 750 
 Q.32.  A  sum  of  money  becomes  3  times 
 in  10  years  at  the  rate  of  compound 
 interest  (compounded  annually),  In  how 
 many years will it become 81 times? 
 SSC MTS 02/08/2019 (Evening) 
 (a) 40 years  (b) 50 years 
 (c) 35 years  (d) 30 years 
 Q.33.  The  difference  between  the 
 compound  interest  and  the  simple 
 interest  on  a  sum  at  10%  p.a.  for  three 
 years is Rs 155. the sum (in Rs) is: 
 SSC CHSL 11/07/2019 (Afternoon) 
 (a) 5500  (b) 6000  (c) 6600  (d) 5000 
 Q.34.  A  certain  amount  invested  at  a 
 certain  rate,  compounded  annually, 
 grows  to  an  amount  in  ?ve  years,  which 
 is  a  factor  of  1.1881  more  than  to  what  it 
 would  have  grown  in  three  years.  What  is 
 the rate percentage? 
 SSC CHSL 04/07/2019 (Evening) 
 (a) 9  (b) 8.1  (c) 8  (d) 9.2 
 Q.35.  Rs  60000  invested  at  a  certain  rate 
 for  a  certain  even  number  of  years, 
 compounded  annually,  grows  to  Rs 
 63,654.  To  how  much  amount  would  it 
 grow  if  it  is  invested  at  the  same  rate  for 
 half period? 
 SSC CHSL 04/07/2019 (Afternoon) 
 (a) Rs 61800  (b) Rs 61809 
 (c) Rs 61675  (d) Rs 61827 
 Q.36.  A  sum  invested  at  8%  p.a.  amounts 
 to  Rs  20280  at  the  end  of  one  year,  when 
 the  interest  is  compounded  half  yearly. 
 What  will  be  the  simple  interest  on  the 
 same  sum  for  4  years  at  double  the 
 3 
 5 
 earlier rate of interest? 
 SSC CHSL 04/07/2019 (Morning) 
 (a) Rs 13500  (b) Rs 13800 
 (c) Rs 14200  (d) Rs 14500 
 Q.37.  The  simple  interest  on  a  certain 
 sum  for  3  years  at  10%  per  annum  is 
 1 
 2 
 Rs  2,940.  What  will  be  the  compound 
 interest  on  the  same  sum  for  2  years 
 1 
 2 
 at  the  same  rate  when  interest  is 
 compounded yearly (nearest to a rupee)? 
 SSC CHSL 02/07/2019 (Afternoon) 
 (a) 2,272  (b) 2,227   (c) 2,327  (d) 2,372 
 Q.38.  The  difference  between  the 
 compound  interest  and  simple  interest 
 on Rs x at 8% per annum for 2 years is Rs 
 19.20. What is the value of x ? 
 SSC CGL 10/06/2019 (Afternoon) 
 (a) 2,500  (b) 3,200 (c) 2,800 (d) 3,000 
 Q.39.  A  sum  of  Rs  12,000  amounts  to  Rs 
 20,736  in  3  years  at  a  certain  rate  percent 
 per  annum,  interest  compounded 
 annually.  What  will  the  amount  of  the 
 same  sum  be  in  2  years  at  the  same  rate 
 on compound interest ? 
 SSC CGL 10/06/2019 (Morning) 
 (a) Rs 15,640  (b) Rs 17,820 
 (c) Rs 17,280  (d) Rs 14,520 
 Q.40.  A  sum  of  Rs  x  was  borrowed  and 
 paid  back  in  two  equal  yearly 
 installments,  each  of  Rs  35,280.  If  the 
 rate  of  interest  was  5%,  compounded 
 annually, then the value of x is: 
 SSC CGL 07/06/2019 (Afternoon) 
 (a) 64,400  (b) 65,600 
 (c) 64,800              (d) 65,400 
 Q.41.  A  person  borrowed  a  certain  sum 
 at  10%  p.a.  for  three  years,  interest  being 
 compounded  annually.  At  the  end  of  two 
 years,  he  repaid  a  sum  of  Rs.  6634  and  at 
 the  end  of  the  third  year,  he  cleared  off 
 the  debt  by  paying  Rs.  13,200.  What  was 
 the sum borrowed by him ? 
 SSC CGL 06/06/2019 (Evening) 
 (a) Rs. 16,400  (b) Rs. 15,400 
 (c) Rs. 15,600  (d) Rs. 16,500 
 Q.42  .  A  sum  of  Rs  15,000  is  lent  at  16% 
 p.a.  compound  interest.  What  is  the 
 difference  between  the  compound 
 interest  for  the  second  year  and  the  third 
 year ? 
 SSC CGL 06/06/2019 (Morning) 
 (a) Rs 544  (b) Rs 445.44 
 (c) Rs 454.88  (d) Rs 548 
 Q.43.  What will be the compound interest 
 (nearest  to  Rs  1)  on  a  sum  of  Rs  25,000 
 for  2  years  at  12%  p.a.,  if  the  interest  is 
 compounded 8-monthly? 
 SSC CGL 04/06/2019 (Evening) 
 (a) Rs 6,394  (b) Rs 6.439 
 (c) Rs 6,493           (d) Rs 6.349 
 Q.44.  The  compound  interest  on  a 
 certain  sum  in  2  years  at  10%  p.a., 
 1 
 2 
 interest  compounded  yearly,  is  Rs  1,623. 
 The sum is : 
 SSC CGL 04/06/2019 (Afternoon) 
 (a) Rs 5,000  (b) Rs 6,000 
 (c) Rs 6,500           (d) Rs 7,200 
 Q.45.  The  interest  on  Rs  24,000  in  years 
 compounded  annually  when  the  rates  are 
 8%  p.a  and  10%  p.a  for  two  successive 
 years is: 
 SSC CPO 16/03/2019 (Afternoon) 
 (a) ?3994  (b) ?4512  (c) ?5040 (d) ?5866 
 Q.46.  The  annual  interest  compounded 
 on  any  amount  is  Rs  1,320  for  the 
 second  year  and  Rs  1,452  for  the  third 
 year.  What  will  be  the  original  amount  at 
 the beginning of the ?rst year ? 
 SSC CPO 15/03/2019 (Evening) 
 (a) 12,650  (b) 13,200 
 (c) 12,970  (d) 12,000 
 Q.47.  A sum of Rs 18,000 is invested for 
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 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 16  months  at  8%  per  annum 
 compounded  half-yearly.  What  is  the 
 percentage gain ? 
 SSC CPO 12/03/2019 (Evening) 
 (a) 9%  (b) 11%  (c) 10%     (d) 12% 
 Practice Questions 
 SSC CHSL 2023 Tier - 2 
 Q.48.  The  compound  interest  of  ?6,000 
 in  two  years,  if  the  rate  of  interest  is  2.5% 
 per  annum  for  the  ?rst  year  and  2%  per 
 annum for the second year, will be: 
 SSC CHSL Tier II  10/01/2024 
 (a) ?273  (b) ?135  (c) ?270  (d) ?240 
 SSC CPO 2023 Tier - 1 
 Q.49.  A  sum  of  ?1,00,000  was  taken  from 
 a  bank  at  the  rate  of  7%  p.a  to  be 
 compounded  annually  for  5  years. 
 Calculate  the  compound  interest. 
 (Closest to a ?) 
 SSC CPO 03/10/2023 (2nd  Shift) 
 (a) ?40,567  (b) ?40,000 
 (c) ?20,963  (d) ?40,255 
 Q.50.  A  sum  of  money  was  invested  at 
 10%  interest  per  year,  compounded 
 half-yearly,  for  18  months.  If  the  amount 
 payable  on  maturity  was  ?64,827,  what 
 was the sum invested ? 
 SSC CPO 04/10/2023 (1st Shift) 
 (a) ?55,600  (b) ?56,500 
 (c) ?56,800  (d) ?56,000 
 Q.51.  Peter  invested  a  certain  sum  of 
 money  in  a  scheme  paying  10%  simple 
 interest  per  annum,  while  Rachel 
 invested  half  of  the  sum  that  Peter 
 invested  in  a  scheme  paying  10%  interest 
 per  annum  compounded  annually.  Also, 
 while  Peter  invested  for  2  years,  Rachel 
 invested  for  3  years.  If  the  difference  in 
 the  interest  earned  by  Peter  and  Rachel 
 was  ?897,  what  was  the  sum  that  Rachel 
 had invested ? 
 SSC CPO 04/10/2023 (2nd Shift) 
 (a) ?12,900  (b) ?13,000 
 (c) ?13,100  (d) ?12,960 
 Q.52.  A  sum  of  money  amounts  to 
 ?1,200  in  2  years  and  becomes  ?1,260  in 
 3 years at compound interest, when 
 interest  is  compounded  annually.  What  is 
 the  rate  of  compound  interest  per 
 annum? 
 SSC CPO 04/10/2023 (3rd Shift) 
 (a) 6%  (b) 3%  (c) 5%  (d) 4% 
 Q.53.  If  interest  be  compounded 
 half-yearly,  then  ?nd  the  compound 
 interest on ?8,000 at 20% p.a. for 1 year. 
 SSC CPO 05/10/2023 (1st Shift) 
 (a) ?1685 (b) ?1680 (c) ?1675 (d) ?1690 
 Q.54.  Find  the  amount  (integral  value 
 only)  if  a  sum  of  ?6,500  is  being 
 borrowed  at  10%  interest  per  annum  for 
 2  years  if  interest  is  compounded  half  - 
 yearly. 
 SSC CPO 05/10/2023 (2nd Shift) 
 (a) ?7900 (b) ?8150 (c) ?8250 (d) ?7650 
 SSC MTS 2023 Tier - 1 
 Q.55.  Geeta  deposited  a  certain  sum  of 
 money  in  her  bank  account  which 
 amounted  to  ?27,783  in  3  years  at  5%  per 
 annum,  the  interest  being  compounded 
 annually. What amount did she deposit? 
 SSC MTS 01/09/2023 (1st Shift) 
 (a) ?25,500  (b) ?25,000 
 (c) ?26,000  (d) ?24,000 
 Q.56.  A sum of money becomes ?6,400 
 in  3  years  and  ?8,100  in  5  years  on 
 compound  interest  compounded 
 annually.  Find  the  rate  of  interest  per 
 annum. 
 SSC MTS 01/09/2023 (2nd Shift) 
 (a) 12  (b) 12  (c) 12  (d) 12 
 3 
 8 
 4 
 8 
 6 
 8 
 5 
 8 
 Q.57.  The  difference  in  interests  earned 
 on  ?1,50,000  at  an  8%  rate  of  interest  per 
 annum  in  a  year  when  the  interest  in 
 compounded  semi-annually  and  annually, 
 respectively, is ? ______. 
 SSC MTS 01/09/2023 (3rd Shift) 
 (a) 360  (b) 120  (c) 240  (d) 420 
 Q.58.  At  what  rate  of  interest  per  annum, 
 compounded  annually,  will  an  amount  of 
 ?8,000  yield  a  compound  interest  of 
 ?904.2 in 2 years ? 
 SSC MTS 04/09/2023 (1st Shift) 
 (a) 6%  (b) 8%  (c) 10%  (d) 5.5% 
 Q.59.  Find  the  compound  interest 
 (Compounded  annually)  on  ?2,000  for  2 
 years at 10% per annum. 
 1 
 2 
 SSC MTS 04/09/2023 (2nd Shift) 
 (a) ? 561  (b) ? 500  (c) ? 521  (d) ? 541 
 Q.60.  The difference between the 
 compound  interest  (Compounded 
 annually)  and  simple  interest  for  an 
 amount  of  ?85,000  in  2  years  is  ?850. 
 Find the rate of interest per annum. 
 SSC MTS 04/09/2023 (3rd Shift) 
 (a) 5%  (b) 10%  (c) 8%  (d) 12% 
 Q.61.  ?1,250  at  12%  per  annum 
 compounded annually will amount to 
 ?1,568 in: 
 SSC MTS 05/09/2023 (1st Shift) 
 (a) 4 yrs  (b) 1 yr  (c) 2 yrs  (d) 3 yrs 
 Q.62.  Find the amount of ?75,000 for one 
 year  at  the  rate  of  16%  per  annum,  if  the 
 interest  is  compounded  quarterly. 
 (rounded off to two decimal places) 
 SSC MTS 05/09/2023 (2nd Shift) 
 (a) ?87,379.40  (b) ?89,773.40 
 (c) ?87,937.40  (d) ?87,739.40 
 Q.63.  In  how  many  years  will  a  sum  of 
 ?18,000  at  20%  per  annum  compounded 
 half yearly becomes  ? 23,958 ? 
 SSC MTS 05/09/2023 (3rd Shift) 
 (a) 1  (b) 3  (c) 1  (d) 2 
 1 
 2 
 1 
 2 
 1 
 4 
 1 
 2 
 Q.64.  What  is  the  difference  between  the 
 compound  interest,  interest  compounded 
 half  yearly  on  ?72,000  for  1.5  years  at 
 10%  per  annum  and  its  simple  interest 
 for 3 years at 5% per annum? 
 SSC MTS 06/09/2023 (1st Shift) 
 (a) ?559  (b) ?549  (c) ?540  (d) ?449 
 Q.65.  At  what  rate  per  annum  will  a  sum 
 of  ?6,400  fetch  a  compound  interest 
 (Compounded  annually)  of  ?1,344  in  2 
 years? 
 SSC MTS 06/09/2023 (2nd Shift) 
 (a) 10%  (b) 8%  (c) 12%  (d) 5% 
 Q.66.  What  sum  of  money  invested  at  8% 
 per  annum  in  1  years,  compounded 
 1 
 2 
 half-yearly, shall become ?17,576 ? 
 SSC MTS 06/09/2023 (3rd Shift) 
 (a) ?16,500  (b) ?15,000 
 (c) ?15,525  (d) ?15,625 
 Q.67.  A  deposited  ?62,500  at  the  rate  of 
 8%  per  annum  compounded  half  yearly, 
 then  what  is  the  compound  interest  at 
 the end of two years? 
 SSC MTS 08/09/2023 (1st Shift) 
 (a) ?18,161.12  (b) ?12,171.72 
 (c) ?10,821.18  (d) ?10,616.16 
 Q.68.  Find  the  amount  if  ?10,200  is 
 invested  at  the  rate  of  8%  per  annum 
 compound  interest  for  1  years  when 
 1 
 2 
 interest is compounded half yearly (up to 
 two decimal places). 
 SSC MTS 08/09/2023 (2nd Shift) 
 (a) ?11,743.61  (b) ?11,473.61 
 (c) ?11,764.28  (d) ?11,347.28 
 Q.69.  What  will  be  the  compound  interest 
 on  ?30,000  at  10%  per  annum  for  1 
 1    
 2    
 years,  when  interest  is  compounded  half- 
 yearly? 
 SSC MTS 08/09/2023 (3rd Shift) 
 (a) ?4,728.75  (b) ?4,800.75 
 (c) ?5,728.75  (d) ?4,928.75 
 Q.70.  An  amount  of  ?2,000  amounts  to 
 ?2,880 in 2 years. What will be the rate of 
 interest if compounded annually ? 
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 Pinnacle  Day: 82nd - 83rd  Compound Interest 
 SSC MTS 11/09/2023 (1st Shift) 
 (a) 12%  (b) 28%  (c) 10%  (d) 20% 
 Q.71.  What  is  the  compound  interest 
 (in?)  on  ?20,500  for  2  years  at  10%  per 
 annum,  if  the  interest  is  compounded 
 annually? 
 SSC MTS 11/09/2023 (2nd Shift) 
 (a) 5,403  (b) 4,305  (c) 4,530  (d) 4,350 
 Q.72.  In  how  many  years  will  ?1,60,000 
 become  ?2,79,841  at  a  compound 
 interest  (Compounded  annually)  rate  of 
 15% per annum? 
 SSC MTS 11/09/2023 (3rd Shift) 
 (a) 6  (b) 3  (c) 5  (d) 4 
 Q.73.  Hema  invested  ?1,728  at  the  rate 
 of  compound  interest  (Compounded 
 annually)  for  3  years.  She  got  ?4,096 
 after the speci?ed period. Find the rate of 
 interest per annum. 
 SSC MTS 12/09/2023 (1st Shift) 
 (a) 33  %  (b) 30  % 
 1 
 2 
 1 
 2 
 (c) 33  %  (d) 30  % 
 1 
 3 
 1 
 3 
 Q.74.  A  sum  of  ?15,000  was  lent  for  3 
 years  at  the  rate  of  4%,  5%,  6%  per 
 annum,  respectively,  at  compound 
 interest  for  the  ?rst  year,  second  year  and 
 third  year  compounded  annually.  Find  the 
 compound interest for 3 years. 
 SSC MTS 12/09/2023 (3rd Shift) 
 (a) ?2,380.60  (b) ?2,382.60 
 (c) ?2,362.80  (d) ?2,380.80 
 Q.75.  On  what  sum  of  money  will  the 
 difference  between  the  simple  interest 
 and  compound  interest  (Compounded 
 annually)  for  3  years  at  5%  per  annum  be 
 ?15.25? 
 SSC MTS 13/09/2023 (1st Shift) 
 (a) ?2,500  (b) ?1,000 
 (c) ?4,000  (d) ?2,000 
 Q.76.  Find  the  compound  interest  (in  ?) 
 on  ?500  in  2  years  at  20%  per  annum  if 
 the  interest  being  compounded  half  - 
 yearly. 
 SSC MTS 13/09/2023 (3rd Shift) 
 (a) 232.05  (b) 132.05 
 (c) 225.08  (d) 264.05 
 Q.77.  Mr  Kalra  borrowed  ?1,35,000  to 
 meet  the  expenses  of  his  son's 
 education.  If  the  rate  of  interest  is  12% 
 per  annum  compounded  annually,  then 
 how  much  amount  will  he  have  to  make 
 after  2  years  and  3  months  to  settle  the 
 account? 
 SSC MTS 14/09/2023 (1st Shift) 
 (a) ?1,74,424.32  (b) ?1,50,640.40 
 (c) ?1,49,920.32  (d) ?1,74,760 
 Q.78.  What is the amount (in ?) due on a 
 sum  of  money  ?12,500  after  one  year  if 
 the  compound  interest  is  payable  half- 
 yearly at 12% per annum? 
 SSC MTS 14/09/2023 (3rd Shift) 
 (a) 14,450  (b) 14,540 
 (c) 15,440  (d) 14,045 
 SSC CHSL 2023 Tier - 1 
 Q.79.  Find  the  compound  interest  on 
 ?50,000  for  one  year  at  8%  per  annum 
 when compounded half yearly. 
 SSC CHSL 02/08/2023 (2nd Shift) 
 (a) ?3,900  (b) ?3,880 
 (c) ?4,080  (d) ?3,950 
 Q.80.  In  how  many  years  will  ?40000 
 amount  to  ?46656  at  the  rate  of  8% 
 compound interest per annum ? 
 SSC CHSL 02/08/2023 (3rd Shift) 
 (a) 5  (b) 2  (c) 4  (d) 3 
 Q.81.  What  is  the  compound  interest  on 
 ?62,500  for  2  years  at  8%  per  annum 
 compounded yearly ? 
 SSC CHSL 03/08/2023 (3rd Shift) 
 (a) ?10,500  (b) ?10,300 
 (c) ?10,400  (d) ?10,600 
 Q.82.  What  is  the  present  value  of  the 
 sum  if  the  interest  compounded  at  the 
 rate  of  18%  per  anmim  for  two  years  is 
 ?981 ? 
 SSC CHSL 03/08/2023 (4th Shift) 
 (a) ?2,800  (b) ?2,500 
 (c) ?3,600  (d) ?2,400 
 Q.83.  What  is  the  compound  interest  on 
 ?25,000  for  3  years  at  10%  per  annum 
 compounded yearly ? 
 SSC CHSL 04/08/2023 (2nd Shift) 
 (a) ?8,125  (b) ?8,000 
 (c) ?8,200  (d) ?8,275 
 Q.84.  Ashok  invested  ?18,000  for  3  years 
 at  5%  compound  interest  in  a  post  o?ce. 
 If  the  interest  is  compounded  once  in  a 
 year, what sum will he get after 3 years ? 
 SSC CHSL 04/08/2023 (3rd Shift) 
 (a)  22,961.50  (b)  20,837.25  ?  ? 
 (c)  22,6291.75  (d)  21,926.00  ?  ? 
 Q.85.  A  certain  sum  was  invested  at  the 
 rate  of  10%  for  a  period  of  2  years  at 
 compound  interest  and  compounded 
 annually.  The  same  sum  was  invested  for 
 the  same  period  and  same  rate  of 
 interest  at  simple  interest.  If  the 
 difference  of  compound  interest  and 
 simple interest was ?200, ?nd the sum. 
 SSC CHSL 04/08/2023 (4th Shift) 
 (a) ?30,000  (b) ?25,000 
 (c) ?22,000  (d) ?20,000 
 Q.86.  Akhilesh  invested  a  certain  sum 
 which  amounted  to  ?82,000  in  2  years  at 
 6%  per  annum  compound  interest, 
 compounded  annually.  What  was  the 
 sum  invested  (in  ?  )  by  Akhilesh?  (round 
 off to the nearest integer) 
 SSC CHSL 07/08/2023 (2nd Shift) 
 (a) 73,980  (b) 72,680 
 (c) 72,980  (d) 70,980 
 Q.87.  Kalyan  invested  a  sum  of  ?12,000 
 for  two  years  compounded  at  5%  and 
 10%,  respectively.  What  is  the  compound 
 interest (in ?) at the end of two years ? 
 SSC CHSL 07/08/2023 (3rd Shift) 
 (a) 1,880  (b) 1,920  (c) 1,900  (d) 1,860 
 Q.88.  Radha  deposited  ?1,60,000  at  a 
 10%  rate  of  compound  interest  per 
 annum  for  two  years.  If  the  interest  is 
 compounded  semi-annually,  then  what  is 
 the compound interest (in  ) ?  ? 
 SSC CHSL 07/08/2023 (4th Shift) 
 (a) 16,400  (b) 34,481 
 (c) 74,256  (d) 33,600 
 Q.89.  Find  the  compound  interest  on 
 ?10,000  for  1  years  at  20%  per  annum 
 1 
 2 
 interest is  payable half - yearly 
 SSC CHSL 08/08/2023 (1st Shift) 
 (a) ?3,315  (b) ?3,310 
 (c) ?3,305  (d) ?3,320 
 Q.90.  What  is  the  amount  (in?  )  of  debt 
 that  will  be  discharged  in  6  equal 
 installments  of  ?800  each,  if  the  debt  is 
 due in 6 years at 5% per annum ? 
 SSC CHSL 08/08/2023 (1st Shift) 
 (a) 6,600 (b) 7,500  (c) 8,000 (d) 5,400 
 Q.91.  What  is  the  approximate  present 
 value  (in  ?  lakh)  of  an  income  of  ?2.1 
 lakh  to  be  received  after  2  years  if  the 
 rate of interest is 5% ? 
 SSC CHSL 08/08/2023 (2nd Shift) 
 (a) 1.815  (b) 1.975  (c) 1.725  (d) 1.905 
 Q.92.  On  a  sum  of  money  for  2  years 
 compound  interest  and  simple  interest 
 are  ?550  and  ?500.  Find  the  rate  of 
 interest (in per annum). 
 SSC CHSL 08/08/2023 (3rd Shift) 
 (a) 40%  (b)10%  (c) 20%  (d) 30% 
 Q.93.  Basanthi  deposited  50,000  in  a  ? 
 co-operative  bank  which  is  giving 
 compound  interest  at  the  rate  of  10%  per 
 annum.  What  will  be  her  interest  in  the 
 3rd year ? 
 SSC CHSL 08/08/2023 (4th Shift) 
 (a)  66,550  (b)  6,050  ?  ? 
 (c)  5,050  (d)  10,050  ?  ? 
 Q.94.  The  difference  between  the  simple 
 interest  and  the  compound  interest  on  a 
 certain  amount  at  9  %  per  annum  for  two 
 years is ? 162, what is the principal ? 
 SSC CHSL 09/08/2023 (1st Shift) 
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