Tipping

You know what would help me? If restaurants would pre-calculate the amount of the tip and put it on the bill. Trying to figure out what 15% of $37.83 is a real pain, especially once I've had a couple of drinks. They've got these fancy cash registers, have them calculate the what 5, 10, 15 and 20% tip would be. Just circle the amount you want to leave if you are putting it on your credit card. It would give you some guidance if you are paying by cash.

Or maybe I could just write +15% on the bill and let them figure it out. I wonder if that would work?