10% if service was so-so, 15% average, 20% if service was very good. 25% or more next to never. A single penny if service was terrible. I have only done this twice and both times I suggested to person that they should get into another line of work. And for those tip cups at places like Dunkin Donuts
If you don't let them keep the change they look at you like you are a low life.
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