At what rate percent on simple interest will a sum of money double itself in 20 years?  Choose the correct choice from the following
A) 2% B) 6% C) 3% D) 4% E) 5%
P = (P*20*R)/100   R = 5%   ANSW5%R:5%
<result>E</result>
At what rate percent on simple interest will a sum of money double itself in 20 years?