Question:On a certain sum, the simple interest at the end of `6 1/4` years becomes `3/8` of the sum.What is the rate percent ? 

A 7% 
B 6% 
C 5% 
D `5 1/2 %` 

+ Answer
B 

+ Explanation
Let the sum be x. Then, S.I` = (3x)/8`

:. Rate` = ((100 xx (3x)/(8))/(x xx 25/4))`

   `= (300 x)/8 xx 4/(25x) = 6%`

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Irin Moni

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