Discussion

Explanation:

Let amount P becomes 10 times in 18 years. Hence, interest 9P (= 10P - P) is accumulated in 18 years.

For the same amount to become 100 times, an interest of 99P (= 100P - P) has to be accumulated.

Since, interest accumulated has to becomes 11 times, the time required will also be 11 times.

∴ Time required = 18 × 11 = 198 years.

Hence, 198.

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