Aftab buys one dozen pens for Rs 54 and sells them at the rate of 6 for Rs 30. Find his loss or gain %.
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Step-by-step explanation:
Let price of 12 pens = x
Price of 15 pens (1 dozen + 3 more pens) = 30
Price of 1 dozen after reduction = 24
Price of 1 dozen before reduction = 24 +6 = 30
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