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Q.

Simple interest on sum of money is 64/144 of the principal and the no.of years is equal to the rate percent to the annum. The rate percent per annum is

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a

56/45%

b

20/3%

c

42/53%

d

20/5%

answer is B.

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Detailed Solution

Solution: $\frac{64}{144} P = \frac{P \times R \times R}{100}$

$\begin{array}{l} R^{2} = \frac{6400}{144} \\ R = \frac{80}{12} = \frac{20}{3} % \end{array}$

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