If an article is sold at 9/10th of its usual selling price, 20% profit would be made on it, find the profit percentage which would have been made on it on selling it at its usual selling price.

33.33%

According to the question =

\(\frac{9}{10}\) = \(\frac{selling \; price}{actual \; selling \; price}\)

Now the profit is 20% 

so, 120% of CP = 9

100% of CP = 7.5

Profit when it is sold at actual selling price = (10 - 7.5) × \(\frac{100}{7.5}\)  = 33.33%