Selina Textbook Solutions: Compound Interest (Using Formula) | Mathematics Class 9 ICSE PDF Download

 Page 1


Chapter 3. Compound Interest (Using Formula)
Exercise 3(A)
Solution 1: 
Solution 2: 
Solution 3: 
Page 2


Chapter 3. Compound Interest (Using Formula)
Exercise 3(A)
Solution 1: 
Solution 2: 
Solution 3: 
Solution 4: 
Solution 5: 
Page 3


Chapter 3. Compound Interest (Using Formula)
Exercise 3(A)
Solution 1: 
Solution 2: 
Solution 3: 
Solution 4: 
Solution 5: 
Solution 6: 
Solution 7: 
Solution 8: 
Page 4


Chapter 3. Compound Interest (Using Formula)
Exercise 3(A)
Solution 1: 
Solution 2: 
Solution 3: 
Solution 4: 
Solution 5: 
Solution 6: 
Solution 7: 
Solution 8: 
Solution 9: 
 
At 5% per annum the sum of Rs.6,000 amounts to Rs.6,615 in 2 years when the interest 
is compounded annually.
Solution 10: 
Let Rs.x and Rs.y be the money invested by Pramod and Rohit respectively such that 
they will get the same sum on attaining the age of 25 years. 
Pramod will attain the age of 25 years after 25 – 16 = 9 years 
Rohit will attain the age of 25 years after 25 -18 = 7 years 
 
Pramod and Rohit should invest in 400:441 ratio respectively such that they will get the 
same sum on attaining the age of 25 years.
Page 5


Chapter 3. Compound Interest (Using Formula)
Exercise 3(A)
Solution 1: 
Solution 2: 
Solution 3: 
Solution 4: 
Solution 5: 
Solution 6: 
Solution 7: 
Solution 8: 
Solution 9: 
 
At 5% per annum the sum of Rs.6,000 amounts to Rs.6,615 in 2 years when the interest 
is compounded annually.
Solution 10: 
Let Rs.x and Rs.y be the money invested by Pramod and Rohit respectively such that 
they will get the same sum on attaining the age of 25 years. 
Pramod will attain the age of 25 years after 25 – 16 = 9 years 
Rohit will attain the age of 25 years after 25 -18 = 7 years 
 
Pramod and Rohit should invest in 400:441 ratio respectively such that they will get the 
same sum on attaining the age of 25 years.
Solution 11: 
Solution 12: