1. The simple interest on a sum is $$\frac{5}{9}$$ of the principal for 25 years. What is the rate (in percentage) of interest per annum?
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By: anil on 05 May 2019 03.00 pm
Let principal amount = Rs. $$9x$$ => Simple interest = $$frac{5}{9} imes9x=Rs.$$ $$5x$$ Let rate of interest = $$r\%$$ and time period = 25 years => Simple interest = $$frac{P imes R imes T}{100}$$ => $$frac{9x imes r imes25}{100}=5x$$ => $$frac{9r}{4}=5$$ => $$x=frac{5 imes4}{9}=frac{20}{9}\%$$ => Ans - (C)
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