# Percentages and tipping

Lesson

A common usage of percentages in some countries is in the application of taxes, such as sales tax or GST to salable items or in leaving tips at restaurants and cafes.

## Tips

This great infographic from mint.com displays the tipping customs of many countries around the world.  You can see that tips vary from $0$0 to $20%$20%

Tipping is an amount left for the staff, on top of the bill, as a gratuitous measure of good service. Tips are common in the service industry, but in other sectors like government receiving a tip can be considered illegal.

#### Examples

##### Question 1

David is paying for a meal with lots of friends. They received great service, so he is giving a $20%$20% tip. The meal came to $\$182.30$$182.30. How much will he leave as a tip? Think: I need to work out 20%20% of the total meal charge. 20%20% as a fraction is \frac{20}{100}20100. Do: 20%20% of \182.30$$182.30

 $20%$20% of $\$182.30$$182.30 == \frac{20}{100}\times\182.3020100​×182.30 20%20% is \frac{20}{100}20100​ and of in mathematics means multiplication. == \frac{20\times182.30}{100}20×182.30100​ == \36.46$$36.46