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?

Krishnan bought a camera and paid 20% less than its original price. He sold it at 40% profit on the price he had paid. The percentage of profit earned by Krishnan on the original price was

Aparna changes the marked price of an item to 50% above its C.P. What % of discount allowed in approximately to gain 10%?

A & B jointly made a profit of Rs. 1650 and they decided to share it such that 1/3 of A's profit is equal to 2/5 of B's profit. Then profit of B is 

A watch is sold at a profit of 25%. Had it been sold for Rs.120 less then, there would have been a less then of 15%. What is the cost price in rupees?

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

Direction: A shopkeeper has some kg. rice of same price. He sold 150 kg. rice at 25 Rs. per kg. and earned a profit of 25%, another 180 kg. rice is sold at a profit of 20% and rest are sold at a loss of 10%. If the shopkeeper earns Rs. 1230 profit on all the rice that he has sold then answers the following question:

Find the quantity of those rice that are sold at a loss of 10%. 

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?