A shopkeeper sells tea at cost price but uses a weight that is 15% short of 1 kg. What is his gain percentage?
Correct answer A. 17.65%
Explanation
He gives 850 g in place of 1,000 g. Gain% = 150/850 × 100 = 17.65%. Using 15% directly ignores that the base is the 850 g actually given.
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