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) 8 1/3%\n(C) 3 5/3%\n(D) 5 1/3%\n(E) 3 1/7%
Let's be accurate as possible and think first.
(A)
P = (P*30*R)/100\nR = 3 1/3%.

So, the answer is (A)