A shopkeeper buys a dozen pens for rupees 105 and sells them at rupees 10.50 each what is the profit per cent ?
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Answer:
cp of 1 pen = 105 / 12 = > 8.75
sp of 1 pen = 10.5
profit = 10.5 - 8.75 => 1.75
profit % = 1.75 × 100 / 8.75 => 20%
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