Question:The simple interest accrued of a sum of money at the end of four years is `1/5` of its principal. What is the rate of interest per annum ? 

A `4%` 
B `5%` 
C `6%` 
D Date inadequare 

+ Answer
B 

+ Explanation
Let sum = x.Then S.I 

`= x/5`, Times`= 4 `years

:. Rate`= (100 xx x/5 xx 1/(x xx 4))%`

`= 5%`

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Irin Moni

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