The simple interest on a sum for a certain number of years, same as the rate percentage of the interest, is equal to the sum itself. The number of years is equal to:
A.5
B.8
C.10✓ Correct
D.12
Explanation
If rate = time = t, then SI = P×t×t/100 = P, which gives t² = 100, so t = 10 years.
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