Some articles were bought at 6 articles for Rs. 5 and sold at 5 articles for Rs. 6. Gain percent is:

A trader bought 10 items for 2,500 and sold them for ₹3,000. What is his profit percentage?

A person bought a book at 3/4th of its listed price and sold it at 50% more than its listed price. What is the percentage of gain in the transaction?

A person bought an article and sold it at a profit of 20%. Had he bought it at 20% less, what would have been the profit percentage if the selling price had been the same?

A shopkeeper purchased 200 bulbs for ₹10 each. 5 bulbs fused and were thrown away. Remaining sold at ₹12 each. Gain/loss %?

A shopkeeper sells one transistor for Rs. 840 at a gain of 20% and another for Rs. 960 at a loss of 4%. His total gain or loss percent is: