If the cost price of 11 articles is equal to selling price of 10 articles, then profit/ loss percentage?

$\text{S}\text{.P}\text{of}\text{one}\text{artical}=\frac{11}{10}\text{C}\text{.P}$

$\text{P}\%=\frac{\text{P}}{\text{C}\text{.P}}\times 100$

$\text{P}\%=\frac{\text{S}\text{.P}-\text{C}\text{.P}}{\text{C}\text{.P}}\times 100$

$\text{P}\%=\frac{\frac{11}{10}\text{CP}-\text{CP}}{\text{CP}}\times 100$

$\text{P}\%=\frac{\text{1CP}}{\text{10CP}}\times 100$

$\text{Profit}=10\%$