A trader makes a profit equal to the selling price of 75 articles when he sold 100 of the articles. What % profit did he make in the transaction?

Let the selling price of each article be Rs. 1. Then, selling price of 100 articles= Rs. 100, profit on selling 100 articles= Rs. 75, and cost of 100 articles=100-75=Rs.25
Therefore, profit percentage=(75 / 25) x 100=300%