iPad tipping ramps up anxiety

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“Order here” at a coffee shop. Credit: Pixabay. 

You’ve probably experienced that awkward moment: You pay for your pastry or coffee at a cafe, then the cashier turns that iPad-like screen towards you and it asks how much you’d like to tip: 20%, 25%, 30% or no tip. The employee is right there staring at you, and so are the customers in line behind you. So what do you do?