How did she get the register to open so she could get to the change?
She just pushed a button.
You can open a register at any time, otherwise you couldn’t change checkers without having a sale.
If I was to take a guess as to why they are teaching math this way it’s a step to doing away with change.
Just round it off for the customer paying but the store would have to keep a record of the exact amount and the difference would go to the govt in the form of a sales tax.
If it’s done in steps say do away with the penny first.
Then do away with the nickel., dime, quarter, fifty cent, then eventually do away with the $1.