If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?\nOptions:\n(A) 22 1/2 %\n(B) 22%\n(C) 21 %\n(D) 30%\n(E) 40 %
Let's be accurate as possible. Think before you answer.
(A)
9 = (1*40*R)/100\nR = 22 1/2 %.

So, the final answer is (A)