The simple interest on a certain sum at 15% p.a. for three years is ₹ 7,200. The sum is:
$$Interest = P\times n\times (r/100).$$
So,$$ 7200=P\times 3\times 0.15.$$
or, $$P= 7200\div (3\times 0.15).$$
or, $$P=16000.$$
Option A is correct.
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