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At what rate of simple interest in perce...

At what rate of simple interest in percent per annum, the ratio of principal and its interest after `20` years is `1:1` ?

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Let the rate of simple interest per annum `=r%`
Also, if the principal be `Rs p`, then by the question, the simple interest `= Rs p`.
Also , time , `t=20` years
`:. Rsp p=Rs(pxxrxx20)/(100)impliesr=5`
Hence the required rate of simple interest per annum `=5%`.
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