If 50% of (x −y) = 30% of (x + y), then what percent of x is y? 

A retailer gets a discount of 40 % on the printed price of an article. The retailer sells it at the printed price. His gain percent is 

If A is equal to 20% of B and B is equal to 25% of C; then what percent of C is equal to A?

Last financial year, a car company sold 41,800 cars. The target is to sell 51,300 cars this year. What percentage would sales have to increase?

The number of students in a school increases and decreases by 10% respectively in every alternate year. If there was increase in the year 2000 then in how much percentage what happened in the number of students in the vear 2003 in comparison to year 2000.

A basket contains 350 eggs. If 12% of the eggs are rotten, how many eggs are good enough to be sold?

If a number is increased by 30 % and after that it is decreased by 25 % and again it is increased by 25 % then find average change in percentage? (approx.) 

Difference of two numbers is 1890. If 12.5% of one number is 17.5% of the other number, Find the two numbers.