## Decrease a number by a percentage

#### Calculate a discount of 9% on a purchase of 120

This is best approached in two stages.

First, calculate the percentage required using the technique described here – Finding a percentage of a number. Then subtract this amount from the original.

In the example below a 9% discount is applied to a purchase of 120.

If you get a 9% discount on a purchase of 120, you only pay 109.20.

Try it yourself using the examples below…

## Percentages in Excel

The use of percentages in Excel are not the easiest concept to understand.

The percentages you use with Excel are just the same as the ones you might calculate with a calculator but it helps if you think about them slightly differently when calculating in Excel.

Always enter a percentage in Excel as a number followed by a percent sign. If you work this way, you don’t have to worry about all that multiplying and dividing by 100!

Try these short tutorials – the easier ones are at the top…

## Percentage of a number

(What is 7% of 2,500?)

## Increase a number by a percentage

(Increase 24,000 by 4%)

## Decrease a number by a percentage

(Calculate a discount of 9% on a purchase of 120)

## What percentage does a value represent of the total amount?

(7 answers out of 12 were correct. What is the percentage score?)

## Difference between two numbers as a percentage

(Customer numbers changed from 2,800 to 3,200. What percentage increase is that?)
(Customer numbers changed from 3,500 to 3,400. What percentage decrease is that?)