Question: If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?
Options:
(A) 22 1/2 %
(B) 22%
(C) 21 %
(D) 30%
(E) 40 % Random thoughts:
9 = (1*40*R)/100
R = 22 1/2 % The final answer: (A).