I've been meaning to ask this question for awhile.
I returned to the states about a year ago from a very long stay overseas. When I started going to restaurants here, I noticed that many restaurants have programmed their billing device to also print the different tip percentages which I thought was helpful but noticed the percentages are using total amount owed including the sales tax rather than only the items ordered. I can understand the reason but still thought it was odd to expect a tip on the tax as well. This forces me to continue to calculate the tip.
I returned to the states about a year ago from a very long stay overseas. When I started going to restaurants here, I noticed that many restaurants have programmed their billing device to also print the different tip percentages which I thought was helpful but noticed the percentages are using total amount owed including the sales tax rather than only the items ordered. I can understand the reason but still thought it was odd to expect a tip on the tax as well. This forces me to continue to calculate the tip.