Question

A certain sum of money becomes 4 times in 7 years at CI. In how many years will it become 64 times itself?​

Answer 1

Answer:

refer the attachment

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Answer 2

Answer:

21

Step-by-step explanation:

If it becomes 4 times in 7 years then, let initial money be x

After 21 years

4*4*4x hence the required answer is 21