At what rate percent on simple interest will a sum of money double itself in 70 years?	Choose the correct choice from the following choices:
A) 1 3/7%	B) 3 1/9%	C) 3 9/3%	D) 3 2/3%	E) 3 6/3%
P = (P*70*R)/100   R = 1 3/7%   1 3/7%nswer: 1 3/7%
<result>A</result>
At what rate percent on simple interest will a sum of money double itself in 70 years?