Use The Waiter Rater to rate your server. Set your default tipping percentage and if the server does something good then tap the check mark to increment your tip percentage by one. If your server does something bad then tap the X mark. At the end of your meal you will have the tipping percentage that your server earned.
Tap over to the Calculate screen and your tipping percentage is already there. Enter the bill amount and let The Waiter Rater figure out how much to tip and what the total bill should be.
For extra good service leave your phone on the table so your server knows that youre paying attention!