NYTimes.com - Tips Past the Tipping Point

NYTimes.com - Tips Past the Tipping Point- 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.]