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A person lent out a certain sum on si...

A person lent out a certain sum on simple interest and the same sum on compound interest at a certain rate of interest per annum. He noticed that the ratio between the difference of compound interest and simple interest of 3 years and that of 2 years is 25:8. The rate of interest per annum is (a) 10% (b) 11% (c) 12% (d) `12 1/2%`

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