At what rate percent of simple interest will a sum of money double itself in 77 years?  Choose the correct choice from the following answers
A) 6.54 % B) 2.54 % C) 8 .2 % D) 4.94 % E) 1.29 %
Let sum = x. Then, S.I. = x.   Rate = (100 * S.I.) / (P * T) = (100 * x) / (x * 77)   = 100/77 = 1.29 %   ANSW1.29 %R:1.29 %
<result>E</result>
At what rate percent of simple interest will a sum of money double itself in 77 years?