If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?\nOptions:\n(A) 22 1/6 %\n(B) 22 8/2 %\n(C) 25 1/2 %\n(D) 22 1/2 %\n(E) 22 5/2 % OK. Let's think. Some random thoughts first:
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9 = (1*40*R)/100\nR = 22 1/2 % The answer: (D).
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