A sum becomes two times in 5 years at a certain rate of interest. Find the time in which the same amount will be 8 times at the same rate of interest.
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Step-by-step explanation:
sum of money becomes 2 times in 5 years
means it will become 1 time in 5÷2 years
so it will become 8 times in 5÷2×8 years
=20 years
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