Tipping is another problem. When and how much to tip is doubtful for most visitors. It is unwise to tip when you are not supposed to. It’s shameful if you don’t when other people do. It’s simple to get along with those Americans. Just watch them. Here is a never-fail principle : Don’t tip when you eat at the counter. So try to sit at the counter. It’s a place of economy in any restaurant. Do tip only when you sit at a table. The average rate is ten percent of the price of the food. Leave your tip on the table before you leave. In case you don’t have small change, you can change it at the counter. In most American shops you have to go and pay at the counter. But don’t tip the cashier !