A shopkeeper buys 9 pens for the marked price of 8 pens. He sells each pen after allowing a discount of 5% on the marked price. Find his profit percentage.

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1. Let marked price per pen be $M$. Cost per pen = $\frac{8M}{9}$. 
2. Selling price per pen after 5% discount = $0.95M$. 
3. Profit per pen = $0.95M-\frac{8M}{9}=\frac{11M}{180}$. 
4. Profit% = $\frac{\frac{11M}{180}}{\frac{8M}{9}}	imes100=\frac{11}{180}	imes\frac{9}{8}	imes100=6.875\%$. 
FINAL_ANSWER: c

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