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                                    If the total interest of a principal in `6`years be `30%` of the principal , then the total interest will be equal to the principal inA. `10` yearsB. `20` yearsC. `22` yearsD. `30` years | 
                            
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Answer» Let the principal be `Rsx` and the rate of yearly simple interest be `r%` Then, the interest in `6` years `=Rs x xx(30)/(100)=Rs(3x)/(10)` `:.(x xx rxx6)/(100)=(3x)/(10)impliesr=(3x xx100)/(x xx6xx10)=5` `:.` The rate of interest `=5%` Also, let the required time `=t` years `:.(x xx5xxt)/(100)=ximpliest=(100xx x)/(5xx x)=20` `:.` The required time `=20`years.  | 
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