Question: At what rate percent on simple interest will a sum of money double itself in 40 years?\nOptions:\n(A) 3 1/3%\n(B) 2 1/2%\n(C) 3 9/3%\n(D) 3 2/3%\n(E) 3 6/3% Random thoughts:
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P = (P*40*R)/100\nR = 2 1/2% The final answer: (B).
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