Question:In how many years will a sum of money double itself at `12%`per annum ? 

A `6` years `9` month 
B `7` years` 6` month 
C `8` years `3  `month` 
D `8`years `4 ` month` 

+ Answer
D 

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

:. Time`= (100 xx S.I)/(sum xx Rate)`

`= ((100 xx x)/(x xx 12)) years`

`= 8 1/3`

`= 8` years` 4` month`

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Irin Moni

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