Unlike most other countries, when eating out at sit-down restaurants, a tip is expected to be added to the bill by you. Generally, an 18-25% tip is customary to leave. In order to get the tip amount, let’s use the example of a $60 bill with a 20% tip. Take 60 and multiply .2, and you would get $12, add those two up, and your total amount is $72. Another hack is to move the decimal place one to the left and double that number. This gives you a 20% tip. An example is if you have a $55.00 bill, you would move the decimal place over and double it. To get the final tip, it would look like this: 5.500 x 2 = $11.00.