The compound interest on a certain sum of money for 2 years, at 20% p.a, is Rs. 440. Find the simple interest for the same sum, at the same rate, for the same time.

For two years, the difference between compound interest and simple interest on a principal P at 20% is P times 20 divided by 100 squared, yielding 0.04P. Setting 0.04P equal to 440 gives a principal of 11000. The simple interest is 11000 times 20 times 2 divided by 100, resulting in Rs. 400.

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