If rupee one produces rupees nine over a period of 42 years, find the rate of simple interest?\nOptions:\n(A) 22 1/7 %\n(B) 22 3/2 %\n(C) 21 3/7 %\n(D) 22 1/2 %\n(E) 22 1/2 %
Let's be accurate as possible and think first.
(C)
9 = (1*42*R)/100\nR = 21 3/7 %.

Final answer: (C)