Question
In case of gain, $\text{S.P}=\frac{(100+\text{gain}\%)\times\text{C.P.}}{100}$

Answer

We know that, Gain $=$ selling price $–$ cost price
$\text{Gain}\%=\frac{\text{Gain}}{\text{Cost price}}\times100$
$\text{Selling price}=\frac{100+\text{Gain}\%}{100}\times\text{Cost price}$

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