Often prices are increased or decreased by a percentage.

In this section we consider how to increase or decrease quantities by using percentages.

Katie earns £40 per week for her part-time job. She is to be given a 5% pay rise.

How much will she earn per week after the pay rise?

The prices of all the televisions in a shop are to be increased by 8%.

Calculate the new price of a television that originally cost £150.

In a sale the cost of a computer is reduced by 30%. The normal price of the computer was £900.

Calculate the sale price of the computer.