By selling an article for Rs. 450, I lose 20%. For what price should I sell it to gain 20% ?

A fruit merchant makes a profit of 25% by selling mangoes at a certain price. If he charges Re. 1 more on each mango, he would gain 50%. At first the price of one mango was

A merchant loses 10% by selling an article. If the cost price of the article is 15, then the selling price of the article is

Pooja wants to sell a watch at a profit of 20%. She bought it at 10% less and sold it at 30 less, but still she gained 20%. The cost price of watch is

There is 10% loss if an article is sold at Rs. 270. Then the cost price of the article is