If the cost price of 10 articles is equal to the selling price of 9 articles then the profit percentage is
CP of 10 articles = SP of 9 articles
CP of 1 article= SP of 9/10 article
Let the SP of 1 article be "m". Hence the CP of 1 article is 9m/10
Profit percentage=$$\frac{m-\frac{9m}{10}}{\frac{9m}{10}}\times\ 100=\frac{\frac{m}{10}}{\frac{9m}{10}}\times\ 100=\frac{100}{9}\%$$
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