When it comes to dining, tipping at least 15% to 20% is traditional etiquette, say experts.
It seems many Americans disagree.
Almost 1 in 5, 18%, of people tip less than 15% for an average meal at a sit-down restaurant — and an additional 2% tip nothing at all, according to a Pew Research Center survey, which polled 11,945 U.S. adults. More than a third, 37%, said 15% is…

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