If Manoj buys 324 toffees for Rs 486, then how many toffees should he sell for Rs 90 to make 50% profit?

Anil bought two articles A and B at a total cost of ₹ 10,000. He sold the article A at 15% profit and the actacle B at 10% loss. In the whole deal, be made no profit or no loss. Find the selling price of the article A.

A shopkeeper gains 20 percent by giving a discount of 10 percent of the marked price of a toy. If he had given a discount of 20 percent, then what would be his profit percentage?

By what fraction selling price ( S.P. ) must be multiplied to get the cost price ( C.P. ) if the loss is 20%? 

There is a loss of 5% by selling an article for Rs.665. In order to get 12% profit on that article, its selling price has to be kept?

A mobile plan costs Rs. 32 for 6 minutes. What is the approximate cost, in rupees, for 4 minutes?

A man gain 15% by selling a calculator for a certain price. If he sells it at the triple price, then what will be the profit percentage?