1.

In a bank, principal increases continuously at the rate of 5% per year. In how many years Rs 1000 double itself?

Answer» `(dp)/(dt)=5/100P`
`int_1000^2000 (dp)/p=int_0^t(dt)/20`
`ln|2000|-ln|1000|=t/20`
`ln|2|=t/20`
`t=20ln|2| years`


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