1. If a sum of money doubles itself in 8 yrs, then the interest rate in percentage is ?
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By: anil on 05 May 2019 01.48 am
Let the sum = $$Rs.$$ $$x$$ and rate of interest = $$r\%$$ => Amount after 8 years = $$Rs.$$ $$2x$$ => Simple interest = $$(2x-x)=Rs.$$ $$x$$ Also, SI = $$frac{P imes r imes t}{100}$$ => $$frac{x imes r imes 8}{100}=x$$ => $$r=frac{100}{8}=12frac{1}{2}\%$$ => Ans - (D)
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