The ratio of difference between compounded interest and simple interest for 3years to the difference...........

Quantitative Aptitude ( CCS) Compound Interest

The ratio of difference between compounded interest and simple interest for 3years to the difference between C.I and S.I for 2years is 31 : 10. What is rate of percent per annum ?

20%

25%

16(2/3)%

10%

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Explanation:

Principal
A A A
. B B
. B
. C
Difference between C.I & S.I for 3yrs = 3B+C
Difference between C.I & S.I for 2yrs = B
Now …. (3B+C)/B = 31/10
B = 10
C = 1
Rate = C/B = 1/10 = 10%