Question:At a certain rate of simple interest a certain sum doubles itself in `10` years.It will treble itself in : 

A `12 years` 
B `15 years` 
C `20 years ` 
D `30 years` 

+ Answer
C 

+ Explanation
Let sum = x.Then, S.I.= x .Time = `10`

:. Rate`= ((100 xx x)/(x xx 10))%`

`= 10%`

Now, sum= x,S.I.= 2x, Rate`= 10%`

:. Time`= (100 xx 2x)/(x xx 10) years`

`= 20 years`.

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Irin Moni

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