a sum of money becomes 8 5 itself in 5years at..., Simple Interest, General Mathematics

Question:A sum of money becomes $(8/5) of itself in$ 5 $y e a r s a t a c e r t a \in r a t e o f \int e r e s t . T h e r a t e o f \int e r e s t i s :$

A  $5%$  
B  $8%$  
C  $10%$  
D  $12%$

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+ AnswerD

+ ExplanationLet sum = x.S.I.

 $= ((8x)/5 - x)$ 

 $= (3x)/5,Times = 5 years$ 

:. Rate $= (100 xx (3x)/5 xx 1/(x xx 5))%$ 

 $= 12%$

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