Question:How long will it take a sum of money invested at `5%` p.a. S.I.to incrcease its value by `40%` ? 

A `5 years` 
B `6 years` 
C `7 years` 
D `8 years` 

+ Answer
D 

+ Explanation
Let the  sum be x. Then, amount 

`= 140/100 x = 7x/5`.

:. S.I. = ((7x)/5 - x)`

`= (2x)/5`.

Thus, sum = x, S.I. 

`= (2x)/5 & Rate = 5%`

:. Time`= (100 xx (2x)/5 xx 1/(x xx 5)`

`= 8 years`

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Irin Moni

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