UP Police SI Exam 12 Dec 2017 Shift 2 Solved Paper

A trader goes to a wholesaler to buy 500 kg of merchandise. The wholesaler has a weighing balance that reads 1200 gm for a kg. Later, the trader sells 5 kg to a customer after marking up his cost price by 25% (without realizing that he was cheated by the wholesaler). What is the net gain or loss percent for the trader (approximately)?