Use some thinking to answer the following question. If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?\nOptions:\n(A) 22 1/8 %\n(B) 22 9/2 %\n(C) 22 1/7 %\n(D) 22 1/2 %\n(E) 21 1/2 %
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9 = (1*40*R)/100\nR = 22 1/2 % So the final answer is (D).
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