A shopkeeper purchases 11 knives in Rs. 10 and sells them to the rate of 10 knives for Rs. 11. He earns a profit of `11 %` b. `15 %` c. `20 %` d. `21 %`

A person bought some articles at rate of 11 for Rs 10 and sold them at the rate of 10 for Rs 11 Find the profit/loss %.

A person purchased 11 articles for Rs. 10 and sold at 10 articles for Rs.11.Find the gain percentage.

If I purchased 11 hooks of Rs 100 and sold 10 books for Rs 110, the percentage of profit per book sold is—

A shopkeeper purchased 150 identical pieces of calculators at the rate of Rs. 250 each. He spent an amount of Rs. 2500 on transport and packing. He fixed the labelled of each calculator at Rs. 320. However, he decided to gave a discount of 5% on the labelled price. What is the percentage profit earned by him? a. 14% b. 15% c. 16% d. 20% e. none of these

A fruit seller purchased 20 kg of grapes for Rs. 400. If he sells the graphs at a rate of Rs. 50 per kg, then find his profit percentage.