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Rajeev deposited money in the post office which is doubled in 20 years at a simple rate of interest. In how many years will the original sum triple itself ?

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Your problem `->` Rajeev deposited money in the post office which is doubled in 20 years at a simple rate of interest. In how many years will the original sum triple itself ?


Let, Sum = `X`, Time = `20` years and Amount = `2X`.

`:. SI = X. `

`SI = (P*R*N)/100`

`R = (SI * 100)/(P * N) = (X * 100)/( X * 20 ) = 5` %

`:.` sum of money double at `5` % in `20` years.






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