Answer the following question, with explanation first.
If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?\nOptions:\n(A) 22 1/6 %\n(B) 22 8/2 %\n(C) 25 1/2 %\n(D) 22 1/2 %\n(E) 22 5/2 %

(D)
9 = (1*40*R)/100\nR = 22 1/2 %.

So, the answer is (D)