# Rs 8000 became Rs 9261 in a certain interval of time at the rate of 5% per annum, C.I.. Find the time.

$\begin{array}{l} \text { Amount }=R s .9261 \\ \text { Rate }=5 \% \\ \text { Principal }=R s .8000 \\ \text { Now, } A=P\left(1+\frac{R}{100}\right)^{n} \\ Or, ( \frac{9261}{8000})=\left(\frac{105}{100}\right)^{n} \\ Or, ( \left.\frac{21}{20}\right)^3=\left(\frac{21}{20}\right)^{n} \\ \therefore n=\text { 3years } \end{array}$

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