EXT wrote:
It sounds like a teenage girl at the cleaners, had to use a
calculator to figure out the change from a $20.00 bill. Counting
change up from the amount of the charges manually was taught in
school when I was young, because no cash register of the day could
figure it out and calculators were huge and expensive (circ. 1950s)
and people didn't want to stand around while you did math on a piece
of paper.

For your next cleaning bill of, say, $17.52, give them $21.37.