Math, asked by prashanthh686, 12 hours ago

A sum of money doubles itself in 7 years. in how many years it becomes four fold?

Answers

Answered by Altair321

3

Answer:

Simplest trick

x at t = 0

2x at t = 7

3x at t = 14

4x at t = 21

So it'll become 4 times in 21 years

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