Question:The rate at which a sum becomes four times of itself in `15` years at S.I.will be : 

A `15%` 
B `17 1/2%` 
C `20%` 
D `25%` 

+ Answer
C 

+ Explanation
Let sum = x.Then,S.I.= 3x.

Rate`= ((100 xx 3x)/(x xx 15))%`

`= 20%`

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Irin Moni

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