Please answer the following question by reasoning step-by-step.
How much more would Rs.40000 fetch, after two years, if it is put at 20% p.a. compound interest payable half yearly than if is put at 20% p.a. compound interest payable yearly?\nOptions:\n(A) 482\n(B) 725\n(C) 964\n(D) 837\n(E) 923

(C)
40000(11/10)4 - 40000(6/5)2 = 964.

Thus, the answer is (C)