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?
Example 2
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.
Example 3
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.
A door to door salesman gets 12percent commision on the selling price for the first 20kg that he sells. He gets 20percent commision on the excess he sells,if he sells more than 20 kg . If he had sold 48kg in a month,at rs 80 per kg , calculate his total commision
Original price = 20
Increased by 15%
Then new price = 20 + 15 / 100*20
= 20 + 3 / 20 * 20
=20 + 3
= Rs 23