Question: 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 1/8%\n(C) 3 6/3%\n(D) 9 1/3%\n(E) 3 3/3% Let's think first. Some random reasoning:
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P = (P*30*R)/100\nR = 3 1/3% The final answer: (A).
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