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

Answer

Loss $=$ Cost price $-$ Selling price$\text{Loss}\%=\frac{\text{Loss}}{\text{Cost price}}\times100$
$\text{Cost price}=\frac{100}{100-\text{loss%}}\times\text{selling price}$

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