At what rate percent on simple interest will a sum of money double itself in 30 years?
Choose one.
A) 3 1/3%  B) 8 1/3%  C) 3 5/3%  D) 5 1/3%  E) 3 1/7%
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?