If the selling price of 20 books in the same as the cost price of 21 book find the profit percent Solution
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20 × sp = 21 × cp
cp : sp
20 : 21
profit % = (21-20)/20 × 100 = 1/20 × 100 = 5 %
cp : sp
20 : 21
profit % = (21-20)/20 × 100 = 1/20 × 100 = 5 %
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