About the tip in America, what's the general practice? I used to give 10% of the bill in Europe. For a bill of around 60-70 dollars, I guess I would give 5 dollars ?

Lunch is 15%, dinner is 20%.

After swiping the card, there are options on the receipt, usually fifteen percent, eighteen percent, and twenty percent, with specific amounts attached. You can choose an option based on your preference, fill in the amount, then add the total amount of the purchase and sign the receipt. However, when Chinese-owned stores give receipts to Chinese customers, the options are twenty percent, twenty-five percent, and thirty percent.

In general, there are three options for the tip at the bottom of the bill when you check out: 15%, 18%, and 20%. You can choose one and pay with your card at the end.

Generally it's 15%, 18%, and 20%.