The cost price of a camera is 90% of its selling price. The profit pe…

Let the selling price of the article = 100

then the cost price of the article = 90% of the selling price ( Given in the question)

So the SP : CP = 100 : 90

Profit % = ( 100 - 90 ) × \(\frac{100}{90}\) = $11\frac{1}{9}$%