Question:If a sum of money at simple interest in `6`years,it will become `4` times in : 

A `12 years` 
B `14 years` 
C `16 years` 
D `18 years 

+ Answer
D 

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

:. Rate`= ((100 xx x)/(x xx 6))%`

`= 50/3%`

Now, sum = x and S.I` = 3x`, Rate`= 50/3%`

:. Time`= (100 xx 3x)/(x xx 50/3)`

` = 18 years`

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Irin Moni

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