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                                    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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Answer» 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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