A dishonest shopkeeper claims to sell lentils at a loss of 4%, but he uses an 800 g weight in place of 1 kg. What is his actual gain percentage?
Correct answer C. 20%
Explanation
For 800 g of goods he collects 0.96 × the cost of 1,000 g. Gain factor = 0.96 × 1000/800 = 1.2, so he actually gains 20%.
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