Question:If a sum of money doubles itself in `8` years at simple interest, the rate percent per annum is : 

A `11.5` 
B `12` 
C `12.5` 
D `13` 

+ Answer
C 

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

  Rate`= ((100 xx x)/(x xx 8))%`

`= 12 1/2%`

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Irin Moni

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