The difference between the selling prices of a keyboard at losses 15% and 25% is Rs. 50. Then the cost price of a keyboard is :

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%. 

If the cost of 1 dozen apples is Rs. 18, then the cost of 25 apples will be -

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 Cost price of an article is Rs.220 and profit is 20 %, then what will be the selling price of the article?

A shopkeeper bought 80 pens in Rs. 400. He sold 40 pens at 60% profit and sold the remaining pens at 20% profit. If he had sold all the pens at a 15% profit, how much less profit would he have made?

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

Mr. Kiran sold a bus for Rs.18,700 at a loss of 15 %. At what price should the bus be sold to get a profit of 15 %?