WHen I was a kid we lived next door to a supermarket
The ladies (!) on the tills had to memorise every single price in the store - and they were tested every morning and at slack times
fail more than a couple of times and they were out
they always had 2 trolleys at the till - one that the customer had their shopping in and one left behind by the previous customer
as they typed the price into the till they took the item out of one trolley and put it in the other
boy were they fast!!!
"it was said" that they were expected to add a couple of extras onto every customer shop if they had more that a few items
it was also said - and we knew this bit to be true - that once they started someone pointed out my Mum to them and made sur ethey knew her face
Then they knew to NEVER add any extras onto her bill - she would spot it every time
AND she would make them go back and re-do it slowly no matter how many people got helpd up
and she was never wrong - which pacified the people she had delayed
and that was why new staff HAD to know who she was
WOrking in a shop was much harder in those days - even if my Mum wasn;t shopping there!
Was that Kwik Save?
My supermarket of choice as a skint student, and then again later on when we bought our first house.