Discussion

Explanation:

Let amount P triples in 20 years. Hence, interest 2P (= 3P - P) is accumulated in 10 years.

For the same amount to quadruple, an interest of 3P (= 4P - P) has to be accumulated.

Since, interest accumulated has to become 1.5 times, the time required will also be 1.5 times.

∴ Time required = 10 × 1.5 = 15 years.

Hence, 15.

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