A chart that has been showing up lately on restaurant credit card receipts all over the United States does more than spare you the math. Going against typical tipping custom, it suggests tips calculated on the total bill, including the tax, and in amounts of 15, 20 and 25 percent. [Requires free nytimes.com registration to view.]
Information on what is considered proper tipping etiquette in different situations such as skycaps, hair salons, casinos, cruises, disc jockeys, hotels, limousines, restaurants, trains and taxis.
