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A sum of Rs. 5120 amounts to Rs. 7290 in 3 years at compound interest. Find the rate of interest per annum.

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A sum of Rs. 5120 amounts to Rs. 7290 in 3 years at compound interest. Find the rate of interest per annum.
A. `33(1)/(3)%`
B. `12(1)/(2)%`
C. `8(1)/(3)%`
D. `17(1)/(2)%`
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Correct Answer - B
(i) Use formula for amount and then use laws of indices.
(ii) First make y as subject and then substitue the given values.
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