At what rate percent on simple interest will a sum of money double itself in 50 years? Choose the correct choice from the following answers:	A) 3 1/3%	B) 3 1/9%	C) 3 9/3%	D) 2%	E) 3 6/3%
P = (P*50*R)/100   R = 2%   Answer: 2%
<result>D</result>
At what rate percent on simple interest will a sum of money double itself in 50 years?