How to tip when paying by credit card after dinner in America?

In the United States, the steps of tipping when paying by credit card after meals are as follows:

1, you must swipe your card first.

2. We will receive the returned bill with a column of tips, and some big restaurants will refund you 10%, 15% and 20% of the reference amount of the meal fee. I have already told you the specific figures. Fill them in the column to be given.

Sign your name and it's over.

Tip refers to a form of reward for customers to thank service personnel in the service industry. It originated in London, England in the18th century. At that time, there was a bowl in the middle of the hotel table, which read: Ensure timely service. When customers put the change into the bowl, they will get timely and thoughtful service from the waiter. Connect the first letters of the above English words to become tips, which translates into tips. About 5% to 25% of the total expenditure.