A retailer buys 60 pens and sells them at the purchase price of 72 pens. Determine his profit percentage.
20%
Let the cost price of each pen be \(1\) unit.
Cost price of 60 pens \(= 60\) units, which is the retailer's outlay.
He sells the 60 pens for the price of 72 pens, so his selling price \(= 72\) units.
Profit \(= 72 - 60 = 12\) units.
Profit percentage \(= \frac{12}{60} \times 100 = 20\%\).
Hence, his profit percentage is 20%.
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