Selling price of the chair = 1440 rupees Percentage of loss made by the shopkeeper = 10% Let us assume the price at which the shopkeeper bought the chair = x Then 90% * x = 1440 rupees (90/100) * x = 1440 rupees 9x/10 = 1440 rupees 9x = 1440 * 10 rupees 9x = 14400 rupees x = 14400/9 rupees = 1600 rupees So the price at which the shopkeeper bought the chair was 1600 rupees. I hope the procedure is clear enough for you to inderstand.