Question:A sum of money invested at compound interest amounts to Rs.`800` in `3` years and Rs.`840` in `4` years. What is the rate of interest per annum ? 

A `2%` 
B `4%` 
C `5%` 
D `10%` 

+ Answer
C 

+ Explanation
Interest on Rs.`800` for `1` year = Rs. (840 - 800)`

`= Rs. 40`

:. Rate`= (100 xx 40)/(800 xx 1)%`

`= 5%`

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Irin Moni

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