At what rate percent on simple interest will a sum of money double itself in 30

Question

At what rate percent on simple interest will a sum of money double itself in 30 years?

Options:

A . 3 1/3 %

B . 3 1/2%

C . 4 %

D . 4 1/2 %

Answer: Option A

P = (P*30*R)/100

R = 3 1/3%

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