I find it funny when cashiers have problems with the following example
$7.67 charged
I give
$12.75
They either
a) Pause, look, look again, give me $5 back and change
b) Try to give me back the small change
c) Enter it into the till to see how much they need to give back
d) already rang up $10 into the till and now need to manually calculate the change as the gears start to turn in their head
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