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Question

In how many years a sum of money will double itself at 10% p.a rate of interest?

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Solution

Let the sum of money=Rs xSuppose in T years it becomes double of itself that is Rs 2x at 10% rate of interest.Now, Principal, P=Rs xRate of interest, R=10% per annumAmount, A=Rs 2xTime, T=?Simple interest, SI=P×R×T100SI=x×10×T100SI=RsTx10Using, Amount = Principal+Simple interest2x=x+Tx102x-x=Tx10x=Tx10T=10 years

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