The marked price of an article is ₹ 840. A shopkeeper gives a discount of 15% on the marked price and still makes a profit of 19%. What is the cost price of the article?

Selling price after 15% discount on ₹ 840 = 840 × 0.85 = ₹ 714. If this yields a profit of 19%, then cost price × 1.19 = 714. Therefore, cost price = 714 / 1.19 = ₹ 600. Hence the cost price of the article is ₹ 600.