I used to work as a cashier, both in a grocery store and called Grants. The grocery store we had what I would call bang boxes. You know with rows of numbers, you push down the keys, then have to hit another key to register. Now there was also a tax key and we had to know what was taxed and what wasn't, but, we also had to know, how to count change.
Today's registers, tell what change is after submitting what was given to the teller and some even disburse the change.
We never had calculators in class..I suppose progression with the times allows this now.
What I don't like is when grocery shopping something is on sale. They scan the regular price, then followed on the next line amount for sale..with sale price. When the total runs it takes all savings at once. Hard sometimes to figure it.