How much more would Rs.20000 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?

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How much more would Rs.20000 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?

A. Rs.482
B. Rs.424
C. Rs.842
D. Rs.512
Explanation:
20000(11/10)4 – 20000(6/5)2 = 482