The cost price of 27 articles is the same as the selling price of 18 articles. What is the gain percentage?

A wateh dealer pays 10% customs duty on a watch which costs Rs. 500 abroad. He de- sires to make a profit of 20% after giving a discount of 25% to the buyer. The marked price should be

The ratio of the cost price and selling price of an article is 10 : 11. The gain per cent is:

The marked price of an article is 40% above its cost price. If its selling price is of the marked price, then the profit percentage is

While selling a watch, a shop- keeper gives a discount of 5%. If he gives a discount of 7%, he earns ₹15 less as profit. The marked price of the watch is 

4% of the selling price of an article is equal to 5% of its cost price. Again 20% of the selling price is Rs. 120 more than 22% of its cost price. The ratio of cost price & selling price is