Tipping culture in America is pretty straightforward. If you're eating at a sit-down restaurant, it's expected that you tip your waiter 20% of the cost of your meal in total. This system is in place because paying servers far less than the minimum wage is legal and common, with restaurant owners assuming most of their income will be supplied by tips. Tipped employees in some U.S. states can make as little as $2.13 per hour , which is why it's so important to tip them 20%. Many Europeans visitin…