The compound interest on a certain sum for 2 years is Rs 82 and the simple interest is Rs 80. What is the rate of interest per annum ?

 The compound interest on a certain sum for 2 years is Rs 82 and the simple interest is Rs 80. What is the rate of interest per annum ?

A). 2 %

B). 3 %

C). 4 %

D). 5 %

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