A dishonest dealer marks up his goods by 20% and gives a discount of 10%. Besides, he uses a faulty balance which reads 1 kg for 800g. What is his net profit percentage? MCQ with Answer and Explanation

Let true CP of 1000g be 1000. He marks it at 1200 and sells at a 10% discount, making SP = 1080. But he gives only 800g. The actual CP for him is 800. Net Profit = 1080 - 800 = 280. Net Profit % = (280 / 800) * 100 = 35%.