Question:A sum of money becomes`(8/5) of itself in `5`years at a certain rate of interest. The rate of interest is : 

A `5%` 
B `8%` 
C `10%` 
D `12%` 

+ Answer
D 

+ Explanation
Let sum = x.S.I.

`= ((8x)/5 - x)`

`= (3x)/5,Times = 5 years`

:. Rate` = (100 xx (3x)/5 xx 1/(x xx 5))%`

`= 12%`

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Irin Moni

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