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 Page 1


RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
EXERCISE 14.1 PAGE NO: 14.4
1. Find the compound interest when principal = Rs 3000, rate = 5% per annum and
time = 2 years.
Solution:
Given details are,
Principal (p) = Rs 3000
Rate (r) = 5%
Time = 2years
Interest for the first year = (3000×5×1)/100 = 150
Amount at the end of first year = Rs 3000 + 300 = Rs 3150
Principal interest for the second year = (3150×5×1)/100 = 157.5
Amount at the end of second year = Rs 3150 + 157.5 = Rs 3307.5
? Compound Interest = Rs 3307.5 – Rs 3000 = Rs 307.5
2. What will be the compound interest on Rs. 4000 in two years when rate of
interest is 5% per annum?
Solution:
Given details are,
Principal (p) = Rs 4000
Rate (r) = 5%
Time = 2years
By using the formula,
A = P (1 + R/100)
 n
    = 4000 (1 + 5/100)
2
 
    = 4000 (105/100)
2
 
    = Rs 4410 
? Compound Interest = A – P = Rs 4410 – Rs 4000 = Rs 410 
3. Rohit deposited Rs. 8000 with a finance company for 3 years at an interest of 15%
per annum. What is the compound interest that Rohit gets after 3 years?
Solution:
Given details are,
Principal (p) = Rs 8000
Rate (r) = 15%
Time = 3years
By using the formula,
A = P (1 + R/100)
 n
        = 8000 (1 + 15/100)
3
 
Page 2


RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
EXERCISE 14.1 PAGE NO: 14.4
1. Find the compound interest when principal = Rs 3000, rate = 5% per annum and
time = 2 years.
Solution:
Given details are,
Principal (p) = Rs 3000
Rate (r) = 5%
Time = 2years
Interest for the first year = (3000×5×1)/100 = 150
Amount at the end of first year = Rs 3000 + 300 = Rs 3150
Principal interest for the second year = (3150×5×1)/100 = 157.5
Amount at the end of second year = Rs 3150 + 157.5 = Rs 3307.5
? Compound Interest = Rs 3307.5 – Rs 3000 = Rs 307.5
2. What will be the compound interest on Rs. 4000 in two years when rate of
interest is 5% per annum?
Solution:
Given details are,
Principal (p) = Rs 4000
Rate (r) = 5%
Time = 2years
By using the formula,
A = P (1 + R/100)
 n
    = 4000 (1 + 5/100)
2
 
    = 4000 (105/100)
2
 
    = Rs 4410 
? Compound Interest = A – P = Rs 4410 – Rs 4000 = Rs 410 
3. Rohit deposited Rs. 8000 with a finance company for 3 years at an interest of 15%
per annum. What is the compound interest that Rohit gets after 3 years?
Solution:
Given details are,
Principal (p) = Rs 8000
Rate (r) = 15%
Time = 3years
By using the formula,
A = P (1 + R/100)
 n
        = 8000 (1 + 15/100)
3
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
    = 8000 (115/100)
3
 
    = Rs 12167 
? Compound Interest = A – P = Rs 12167 – Rs 8000 = Rs 4167 
4. Find the compound interest on Rs. 1000 at the rate of 8% per annum for 1 ½ 
years when interest is compounded half yearly.
Solution:
Given details are,
Principal (p) = Rs 1000
Rate (r) = 8%
Time = 1 ½ years = 3/2 × 2 = 3 half years
By using the formula,
A = P (1 + R/200)
 2n
= 1000 (1 + 8/200)
3
     
= 1000 (208/200)
3
     
= Rs 1124.86 
? Compound Interest = A – P = Rs 1124.86 – Rs 1000 = Rs 124.86 
5. Find the compound interest on Rs. 160000 for one year at the rate of 20% per
annum, if the interest is compounded quarterly.
Solution:
Given details are,
Principal (p) = Rs 160000
Rate (r) = 20% = 20/4 = 5% (for quarter year)
Time = 1year = 1 × 4 = 4 quarters
By using the formula,
A = P (1 + R/100)
 n
    = 160000 (1 + 5/100)
4
 
    = 160000 (105/100)
4
 
    = Rs 194481 
? Compound Interest = A – P = Rs 194481 – Rs 160000 = Rs 34481 
6. Swati took a loan of Rs. 16000 against her insurance policy at the rate of 12 ½ %
per annum. Calculate the total compound interest payable by Swati after 3 years.
Solution:
Given details are,
Principal (p) = Rs 16000
Rate (r) = 12 ½ % = 12.5%
Time = 3years
Page 3


RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
EXERCISE 14.1 PAGE NO: 14.4
1. Find the compound interest when principal = Rs 3000, rate = 5% per annum and
time = 2 years.
Solution:
Given details are,
Principal (p) = Rs 3000
Rate (r) = 5%
Time = 2years
Interest for the first year = (3000×5×1)/100 = 150
Amount at the end of first year = Rs 3000 + 300 = Rs 3150
Principal interest for the second year = (3150×5×1)/100 = 157.5
Amount at the end of second year = Rs 3150 + 157.5 = Rs 3307.5
? Compound Interest = Rs 3307.5 – Rs 3000 = Rs 307.5
2. What will be the compound interest on Rs. 4000 in two years when rate of
interest is 5% per annum?
Solution:
Given details are,
Principal (p) = Rs 4000
Rate (r) = 5%
Time = 2years
By using the formula,
A = P (1 + R/100)
 n
    = 4000 (1 + 5/100)
2
 
    = 4000 (105/100)
2
 
    = Rs 4410 
? Compound Interest = A – P = Rs 4410 – Rs 4000 = Rs 410 
3. Rohit deposited Rs. 8000 with a finance company for 3 years at an interest of 15%
per annum. What is the compound interest that Rohit gets after 3 years?
Solution:
Given details are,
Principal (p) = Rs 8000
Rate (r) = 15%
Time = 3years
By using the formula,
A = P (1 + R/100)
 n
        = 8000 (1 + 15/100)
3
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
    = 8000 (115/100)
3
 
    = Rs 12167 
? Compound Interest = A – P = Rs 12167 – Rs 8000 = Rs 4167 
4. Find the compound interest on Rs. 1000 at the rate of 8% per annum for 1 ½ 
years when interest is compounded half yearly.
Solution:
Given details are,
Principal (p) = Rs 1000
Rate (r) = 8%
Time = 1 ½ years = 3/2 × 2 = 3 half years
By using the formula,
A = P (1 + R/200)
 2n
= 1000 (1 + 8/200)
3
     
= 1000 (208/200)
3
     
= Rs 1124.86 
? Compound Interest = A – P = Rs 1124.86 – Rs 1000 = Rs 124.86 
5. Find the compound interest on Rs. 160000 for one year at the rate of 20% per
annum, if the interest is compounded quarterly.
Solution:
Given details are,
Principal (p) = Rs 160000
Rate (r) = 20% = 20/4 = 5% (for quarter year)
Time = 1year = 1 × 4 = 4 quarters
By using the formula,
A = P (1 + R/100)
 n
    = 160000 (1 + 5/100)
4
 
    = 160000 (105/100)
4
 
    = Rs 194481 
? Compound Interest = A – P = Rs 194481 – Rs 160000 = Rs 34481 
6. Swati took a loan of Rs. 16000 against her insurance policy at the rate of 12 ½ %
per annum. Calculate the total compound interest payable by Swati after 3 years.
Solution:
Given details are,
Principal (p) = Rs 16000
Rate (r) = 12 ½ % = 12.5%
Time = 3years
 
 
 
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 16000 (1 + 12.5/100)
3
 
    = 16000 (112.5/100)
3
 
    = Rs 22781.25 
? Compound Interest = A – P = Rs 22781.25 – Rs 16000 = Rs 6781.25 
 
7. Roma borrowed Rs. 64000 from a bank for 1 ½ years at the rate of 10% per 
annum. Compare the total compound interest payable by Roma after 1 ½ years, if 
the interest is compounded half-yearly. 
Solution: 
Given details are,  
Principal (p) = Rs 64000 
Rate (r) = 10 % = 10/2 % (for half a year) 
Time = 1 ½ years = 3/2 × 2 = 3 (half year) 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 64000 (1 + 10/2×100)
3
 
    = 64000 (210/200)
3
 
    = Rs 74088 
? Compound Interest = A – P = Rs 74088 – Rs 64000 = Rs 10088 
 
8. Mewa lal borrowed Rs. 20000 from his friend Rooplal at 18% per annum simple 
interest. He lent it to Rampal at the same rate but compounded annually. Find his 
gain after 2 years. 
Solution: 
Given details are,  
Principal (p) = Rs 20000 
Rate (r) = 18 %  
Time = 2 years  
By using the formula, 
Interest amount Mewa lal has to pay, 
By using the formula, 
Simple interest = P×T×R/100  
                         = (20000×18×2)/100 = 7200 
 
Interest amount Rampal has to pay to Mewa lal, 
By using the formula, 
A = P (1 + R/100)
 n
 
Page 4


RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
EXERCISE 14.1 PAGE NO: 14.4
1. Find the compound interest when principal = Rs 3000, rate = 5% per annum and
time = 2 years.
Solution:
Given details are,
Principal (p) = Rs 3000
Rate (r) = 5%
Time = 2years
Interest for the first year = (3000×5×1)/100 = 150
Amount at the end of first year = Rs 3000 + 300 = Rs 3150
Principal interest for the second year = (3150×5×1)/100 = 157.5
Amount at the end of second year = Rs 3150 + 157.5 = Rs 3307.5
? Compound Interest = Rs 3307.5 – Rs 3000 = Rs 307.5
2. What will be the compound interest on Rs. 4000 in two years when rate of
interest is 5% per annum?
Solution:
Given details are,
Principal (p) = Rs 4000
Rate (r) = 5%
Time = 2years
By using the formula,
A = P (1 + R/100)
 n
    = 4000 (1 + 5/100)
2
 
    = 4000 (105/100)
2
 
    = Rs 4410 
? Compound Interest = A – P = Rs 4410 – Rs 4000 = Rs 410 
3. Rohit deposited Rs. 8000 with a finance company for 3 years at an interest of 15%
per annum. What is the compound interest that Rohit gets after 3 years?
Solution:
Given details are,
Principal (p) = Rs 8000
Rate (r) = 15%
Time = 3years
By using the formula,
A = P (1 + R/100)
 n
        = 8000 (1 + 15/100)
3
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
    = 8000 (115/100)
3
 
    = Rs 12167 
? Compound Interest = A – P = Rs 12167 – Rs 8000 = Rs 4167 
4. Find the compound interest on Rs. 1000 at the rate of 8% per annum for 1 ½ 
years when interest is compounded half yearly.
Solution:
Given details are,
Principal (p) = Rs 1000
Rate (r) = 8%
Time = 1 ½ years = 3/2 × 2 = 3 half years
By using the formula,
A = P (1 + R/200)
 2n
= 1000 (1 + 8/200)
3
     
= 1000 (208/200)
3
     
= Rs 1124.86 
? Compound Interest = A – P = Rs 1124.86 – Rs 1000 = Rs 124.86 
5. Find the compound interest on Rs. 160000 for one year at the rate of 20% per
annum, if the interest is compounded quarterly.
Solution:
Given details are,
Principal (p) = Rs 160000
Rate (r) = 20% = 20/4 = 5% (for quarter year)
Time = 1year = 1 × 4 = 4 quarters
By using the formula,
A = P (1 + R/100)
 n
    = 160000 (1 + 5/100)
4
 
    = 160000 (105/100)
4
 
    = Rs 194481 
? Compound Interest = A – P = Rs 194481 – Rs 160000 = Rs 34481 
6. Swati took a loan of Rs. 16000 against her insurance policy at the rate of 12 ½ %
per annum. Calculate the total compound interest payable by Swati after 3 years.
Solution:
Given details are,
Principal (p) = Rs 16000
Rate (r) = 12 ½ % = 12.5%
Time = 3years
 
 
 
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 16000 (1 + 12.5/100)
3
 
    = 16000 (112.5/100)
3
 
    = Rs 22781.25 
? Compound Interest = A – P = Rs 22781.25 – Rs 16000 = Rs 6781.25 
 
7. Roma borrowed Rs. 64000 from a bank for 1 ½ years at the rate of 10% per 
annum. Compare the total compound interest payable by Roma after 1 ½ years, if 
the interest is compounded half-yearly. 
Solution: 
Given details are,  
Principal (p) = Rs 64000 
Rate (r) = 10 % = 10/2 % (for half a year) 
Time = 1 ½ years = 3/2 × 2 = 3 (half year) 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 64000 (1 + 10/2×100)
3
 
    = 64000 (210/200)
3
 
    = Rs 74088 
? Compound Interest = A – P = Rs 74088 – Rs 64000 = Rs 10088 
 
8. Mewa lal borrowed Rs. 20000 from his friend Rooplal at 18% per annum simple 
interest. He lent it to Rampal at the same rate but compounded annually. Find his 
gain after 2 years. 
Solution: 
Given details are,  
Principal (p) = Rs 20000 
Rate (r) = 18 %  
Time = 2 years  
By using the formula, 
Interest amount Mewa lal has to pay, 
By using the formula, 
Simple interest = P×T×R/100  
                         = (20000×18×2)/100 = 7200 
 
Interest amount Rampal has to pay to Mewa lal, 
By using the formula, 
A = P (1 + R/100)
 n
 
 
 
 
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest 
    = 20000 (1 + 18/100)
2
 
    = 20000 (118/100)
2
 
    = Rs 27848 – 20000 (principal amount) 
    = Rs 7848 
 
? Mewa lal gain = Rs (7848 - 7200) = Rs 648 
 
9. Find the compound interest on Rs. 8000 for 9 months at 20% per annum 
compounded quarterly. 
Solution: 
Given details are,  
Principal (p) = Rs 8000 
Rate (r) = 20 % = 20/4 = 5% (for quarterly) 
Time = 9 months = 9/3 = 3 (for quarter year) 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 8000 (1 + 5/100)
3
 
    = 8000 (105/100)
3
 
    = Rs 9261 
? Compound Interest = A – P = Rs 9261 – Rs 8000 = Rs 1261 
 
10. Find the compound interest at the rate of 10% per annum for two years on that 
principal which in two years at the rate of 10% per annum given Rs. 200 as simple 
interest. 
Solution: 
Given details are,  
Simple interest (SI) = Rs 200 
Rate (r) = 10 %  
Time = 2 years  
So, by using the formula, 
Simple interest = P×T×R/100  
P = (SI × 100)/ T×R 
   = (200 × 100) / 2 × 10 
   = 20000/20 
   = Rs 1000 
 
Now, 
Rate of compound interest = 10% 
Time = 2years 
Page 5


RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
EXERCISE 14.1 PAGE NO: 14.4
1. Find the compound interest when principal = Rs 3000, rate = 5% per annum and
time = 2 years.
Solution:
Given details are,
Principal (p) = Rs 3000
Rate (r) = 5%
Time = 2years
Interest for the first year = (3000×5×1)/100 = 150
Amount at the end of first year = Rs 3000 + 300 = Rs 3150
Principal interest for the second year = (3150×5×1)/100 = 157.5
Amount at the end of second year = Rs 3150 + 157.5 = Rs 3307.5
? Compound Interest = Rs 3307.5 – Rs 3000 = Rs 307.5
2. What will be the compound interest on Rs. 4000 in two years when rate of
interest is 5% per annum?
Solution:
Given details are,
Principal (p) = Rs 4000
Rate (r) = 5%
Time = 2years
By using the formula,
A = P (1 + R/100)
 n
    = 4000 (1 + 5/100)
2
 
    = 4000 (105/100)
2
 
    = Rs 4410 
? Compound Interest = A – P = Rs 4410 – Rs 4000 = Rs 410 
3. Rohit deposited Rs. 8000 with a finance company for 3 years at an interest of 15%
per annum. What is the compound interest that Rohit gets after 3 years?
Solution:
Given details are,
Principal (p) = Rs 8000
Rate (r) = 15%
Time = 3years
By using the formula,
A = P (1 + R/100)
 n
        = 8000 (1 + 15/100)
3
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest
    = 8000 (115/100)
3
 
    = Rs 12167 
? Compound Interest = A – P = Rs 12167 – Rs 8000 = Rs 4167 
4. Find the compound interest on Rs. 1000 at the rate of 8% per annum for 1 ½ 
years when interest is compounded half yearly.
Solution:
Given details are,
Principal (p) = Rs 1000
Rate (r) = 8%
Time = 1 ½ years = 3/2 × 2 = 3 half years
By using the formula,
A = P (1 + R/200)
 2n
= 1000 (1 + 8/200)
3
     
= 1000 (208/200)
3
     
= Rs 1124.86 
? Compound Interest = A – P = Rs 1124.86 – Rs 1000 = Rs 124.86 
5. Find the compound interest on Rs. 160000 for one year at the rate of 20% per
annum, if the interest is compounded quarterly.
Solution:
Given details are,
Principal (p) = Rs 160000
Rate (r) = 20% = 20/4 = 5% (for quarter year)
Time = 1year = 1 × 4 = 4 quarters
By using the formula,
A = P (1 + R/100)
 n
    = 160000 (1 + 5/100)
4
 
    = 160000 (105/100)
4
 
    = Rs 194481 
? Compound Interest = A – P = Rs 194481 – Rs 160000 = Rs 34481 
6. Swati took a loan of Rs. 16000 against her insurance policy at the rate of 12 ½ %
per annum. Calculate the total compound interest payable by Swati after 3 years.
Solution:
Given details are,
Principal (p) = Rs 16000
Rate (r) = 12 ½ % = 12.5%
Time = 3years
 
 
 
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 16000 (1 + 12.5/100)
3
 
    = 16000 (112.5/100)
3
 
    = Rs 22781.25 
? Compound Interest = A – P = Rs 22781.25 – Rs 16000 = Rs 6781.25 
 
7. Roma borrowed Rs. 64000 from a bank for 1 ½ years at the rate of 10% per 
annum. Compare the total compound interest payable by Roma after 1 ½ years, if 
the interest is compounded half-yearly. 
Solution: 
Given details are,  
Principal (p) = Rs 64000 
Rate (r) = 10 % = 10/2 % (for half a year) 
Time = 1 ½ years = 3/2 × 2 = 3 (half year) 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 64000 (1 + 10/2×100)
3
 
    = 64000 (210/200)
3
 
    = Rs 74088 
? Compound Interest = A – P = Rs 74088 – Rs 64000 = Rs 10088 
 
8. Mewa lal borrowed Rs. 20000 from his friend Rooplal at 18% per annum simple 
interest. He lent it to Rampal at the same rate but compounded annually. Find his 
gain after 2 years. 
Solution: 
Given details are,  
Principal (p) = Rs 20000 
Rate (r) = 18 %  
Time = 2 years  
By using the formula, 
Interest amount Mewa lal has to pay, 
By using the formula, 
Simple interest = P×T×R/100  
                         = (20000×18×2)/100 = 7200 
 
Interest amount Rampal has to pay to Mewa lal, 
By using the formula, 
A = P (1 + R/100)
 n
 
 
 
 
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest 
    = 20000 (1 + 18/100)
2
 
    = 20000 (118/100)
2
 
    = Rs 27848 – 20000 (principal amount) 
    = Rs 7848 
 
? Mewa lal gain = Rs (7848 - 7200) = Rs 648 
 
9. Find the compound interest on Rs. 8000 for 9 months at 20% per annum 
compounded quarterly. 
Solution: 
Given details are,  
Principal (p) = Rs 8000 
Rate (r) = 20 % = 20/4 = 5% (for quarterly) 
Time = 9 months = 9/3 = 3 (for quarter year) 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 8000 (1 + 5/100)
3
 
    = 8000 (105/100)
3
 
    = Rs 9261 
? Compound Interest = A – P = Rs 9261 – Rs 8000 = Rs 1261 
 
10. Find the compound interest at the rate of 10% per annum for two years on that 
principal which in two years at the rate of 10% per annum given Rs. 200 as simple 
interest. 
Solution: 
Given details are,  
Simple interest (SI) = Rs 200 
Rate (r) = 10 %  
Time = 2 years  
So, by using the formula, 
Simple interest = P×T×R/100  
P = (SI × 100)/ T×R 
   = (200 × 100) / 2 × 10 
   = 20000/20 
   = Rs 1000 
 
Now, 
Rate of compound interest = 10% 
Time = 2years 
 
 
 
 
RD Sharma Solutions for Class 8 Maths Chapter 14 – 
Compound Interest 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 1000 (1 + 10/100)
2
 
    = 1000 (110/100)
2
 
    = Rs 1210 
? Compound Interest = A – P = Rs 1210 – Rs 1000 = Rs 210 
 
11. Find the compound interest on Rs. 64000 for 1 year at the rate of 10% per 
annum compounded quarterly. 
Solution: 
Given details are,  
Principal (p) = Rs 64000 
Rate (r) = 10 % = 10/4 % (for quarterly) 
Time = 1year = 1× 4 = 4 (for quarter in a year) 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 64000 (1 + 10/4×100)
4
 
    = 64000 (410/400)
4
 
    = Rs 70644.03 
? Compound Interest = A – P = Rs 70644.03 – Rs 64000 = Rs 6644.03 
 
12. Ramesh deposited Rs. 7500 in a bank which pays him 12% interest per annum 
compounded quarterly. What is the amount which he receives after 9 months. 
Solution: 
Given details are,  
Principal (p) = Rs 7500 
Rate (r) = 12 % = 12/4 = 3 % (for quarterly) 
Time = 9 months = 9/12years = 9/12 × 4 = 3 (for quarter in a year) 
By using the formula, 
A = P (1 + R/100)
 n
 
    = 7500 (1 + 3/100)
3
 
    = 7500 (103/100)
3
 
    = Rs 8195.45 
? Required amount is Rs 8195.45 
 
13. Anil borrowed a sum of Rs. 9600 to install a hand pump in his dairy. If the rate 
of interest is 5 ½ % per annum compounded annually, determine the compound 
interest which Anil will have to pay after 3 years. 
Solution: 
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