Length of rectangle decreased by 20% and breadth increased by 20%. Effect on area?

If price is reduced by 25% and daily sale increases by 30%, net effect on daily sale is

A number is increased by 20% and then decreased by 20%. Net increase/decrease percentage?

The sum of two numbers is 520. If the bigger number is decreased by 4% and the smaller number is increased by 12%, then the obtained numbers are equal, then smaller number is :

The dearness-allowance of a person with basic salary Rs.7700 is increased to 132% form 125% and the tax deduction on both is increased to 22% from 20%. He got salary increased by

Population of a town was 150000 three years ago. It increased by 2%, 4% and 5% in the last three years. Present population?