A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 20%?

By selling 45 lemons for ₹40, a man loses 20%. How many should he sell for ₹24 to gain 20% in the transaction?

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

By selling 90 ball pens for ₹160 a person loses 20%. How many ball pens should be sold for ₹96 so as to have a profit of 20%?

A man gains 20% by selling an article for a certain price. If he sells it at double the price, the percentage of profit will be

Ravi bought a watch and sold it to Ram at 20% profit. Then Ram wanted to sell it back to Ravi at 20% loss. If Ravi agrees to it, then Ravi will have