If a sum on compound interest becomes 3 times in a certain number of years, then with the same interest rate, in how many years will it become 27 times?
Answer: 12 years
Explanation
If a sum becomes 3 times in x years, and you're using compound interest, then:
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In 2x years, it becomes 3×3=9 time
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In 3x years, it becomes 3×3×3=27 time
So, if the sum triples in 4 years, it becomes 27 times in 4×3=12 years.
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