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Leaving a tip in a
or taxi is a part of life in many
. Usually, we give a tip to a waiter or to a
of staff in a hotel. At other times, we put the tip in a
next to the cash register. With modern
, there is a new way to tip - self checkout machines. People are not so
about them. The machines are asking for tips. They are in airports, stadiums, cookie shops, and
in the USA. Self-checkout machines mean there is no face-to-face
between people. However, many of these machines are asking
to leave a 20 per cent tip. Customers say they are not so happy about leaving a tip and giving
money to a machine.