P purchase an item for Rs 1200 and sold it on a profit of 10%. If he sells it at Rs 1380 then calculate his increase in profit percentage. 

If A purchased 109 cars for Rs.2,64,89,071. How much does 1 car cost? 

Mohan purchased an article and sold it for Rs 2817.50 and earned 15% profit on the cost price. What was the cost price of the article?

If the selling price of a shirt is reduced from 440 to ₹410, the loss increases by 4%. What is the cost price of the shirt?

The cost price of an article is Rs x. It is marked up by 200%. It is sold at Rs. 540 after giving 25% discount. What is the value of x (in Rs)? 

A shopkeeper marked an article 75% above the cost price and sold it after a discount of 50%. Find the cost price of the article if he had a loss of Rs. 156.

The price of 6 pencils is Rs. 30 and that of 12 pens is Rs. 120. What is the average price of 50 pencils and 50 pens?