Do you feel awkward tipping? Here’s how to take control.

This is reprinted by permission from . 

The nearly universal experience of finding yourself face-to-face with a checkout counter screen asking you to select an amount to tip for service can prompt a cascade of awkward questions: How much should you tip on a $5 coffee if anything? How can you decide before the cup has even been poured? Is it rude to select “no tip,” then slink away with your drink?

The…