A dishonest trader uses a weight 10% heavier when buying and a weight 10% lighter when selling, and sells at cost price. What is his gain percentage?
Correct answer C. 22.22%
Explanation
For each 100 units paid for, he receives 110 units, and he sells 90 units at the price of 100. Gain factor = 110/90, so gain = 20/90 × 100 = 22.22%.
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