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Find the rate of Simple interest by whic...

Find the rate of Simple interest by which a given money is doubled in 15 years

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let the sum `= Rs 100`
required rate of simple interest per year to double a certain sum`=100/15=6.66 %`
therefore , a certain sum will be doubled in` 15` years at the rate of `6.66 %` per year.
Your Answer : Rate `= 6.66 %`
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