If rupee one produces rupees nine over a period of 42 years, find the rate of simple interest?\nOptions:\n(A) 22 1/7 %\n(B) 22 3/2 %\n(C) 21 3/7 %\n(D) 22 1/2 %\n(E) 22 1/2 % Stream of consciousness first, then make a decision:
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9 = (1*42*R)/100\nR = 21 3/7 %
Thus, the answer is (C).
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