At what rate percent on simple interest will a sum of money double itself in 30 years?\nOptions:\n(A) 3 1/3%\n(B) 3 5/3%\n(C) 3 1/9%\n(D) 3 1/5%\n(E) 3 1/7% OK. Let's think. Some random thoughts first:
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P = (P*30*R)/100\nR = 3 1/3% The answer: (A).
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