At what rate percent on simple interest will a sum of money double itself in 30 years?  Choose the correct answer
A) 3 1/3%  B) 3 1/6%  C) 3 1/5%  D) 3 5/3%  E) 7 1/3%
P = (P*30*R)/100   R = 3 1/3%   3 1/3%nswer: 3 1/3%
<result>A</result>
At what rate percent on simple interest will a sum of money double itself in 30 years?