Some question: At what rate percent on simple interest will a sum of money double itself in 30 years?
Options:
(A) 3 1/3%
(B) 3 1/8%
(C) 3 7/3%
(D) 3 1/7%
(E) 3 1/1%
Some stream of consciousness:
P = (P*30*R)/100
R = 3 1/3% The answer: (A).