An amount lent at CI becomes 5 times in 7 years. How long will it take for the amount to become 125 times when lent at same rate of interest?
Explanation:
For CI, since amount becomes 5 times in 7 years, it means the amount will become 5 times every 7 years.
For the amount to become 125 (= 53) times, it has to become 5× 3 times. Hence, time required = 7 + 7 + 7 = 21 years.
Hence, 21.
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