New poll shows Americans tipping 15% or less at restaurants, though young adults tip more
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Majority of Americans (57%) tip 15% or less at sit-down restaurants according to a Pew Research poll.
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Young adults tip more generously than older Americans.
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Tipping amounts have grown over time - 10% was standard in 1922, 15% by late 20th century.
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72% say tipping is expected in more places compared to 5 years ago.
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40% oppose businesses suggesting tip amounts on screens.