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A sum, at the compound rate of interest, becomes 2 1/ 2 times in 6 yr. The same sum becomes what times in 18 yr?

5/2
25/4
125/8
625/16

Correct Answer: 125/8

Explanation:

If sum is P, then P becomes 5P/2 in 6 yr.
5P/2 becomes 25P/4 in 12 yr.
25P/4 becomes 125P/8 in 18 yr.
The sum becomes 125/8 times in 18 yr.

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