A trader marks goods 30% above the cost price and then gives a discount of 10% on the marked price. What is the overall result?

💡 Solution & Explanation

Take the cost price as 100. The marked price is 130. A 10% discount on 130 is 13, so the selling price is 117. Compared with the cost of 100, that is 17% profit. Subtracting the percentages (30 − 10 = 20) is a common mistake, because the discount is on the higher marked price.