A trader marks his goods at 45% above the cost price. He offers a discount of 21% to his customers. What is his percentage profit (rounded off to the nearest integer)?

15%

Let the cost price of the article = 100

Markup = 45%

Then the Marked price of that article = 145

Discount offered = 21%

Selling price of that article = 79% of 145 = 79 × \(\frac{145}{100}\) = 114.55

Profit% = ( 114.5 - 100 ) × \(\frac{100}{100}\) = 14.55% = 15%