Businesses sometimes offer discounts to attract customers, or to get rid of old stock. The discounts are typically stated as a percentage of the original price. We need to be able to calculate how much money is being discounted and also the new price after the discount is applied. You should always read a question carefully to see precisely which of these it is asking for.

Example

Exercise

Let’s complete exercise 16E and 16F on pages 269 to 271 of the textbook:

The answers are below:

Discount percentage

If we know what the original cost price of an object was and we know what the current selling price is, we can work out what percentage discount it is being sold at.

Example

Exercise

Let’s complete exercise 16G on page 271 of the textbook:

The answers are below: