The only time cashiers seem to get confused is if I hand over a twenty with the coins for a purchase of, say, $12.57, but they key in $20.00 as cash tendered. Then the register will tell them to return $7.43 when they really owe me $8.00. Some actually have to call a manager over.
I have had that happen.
Most will give me back MY change PLUS the difference, so I wind up with an ashtray full of coins.................
Just remember:
THESE PEOPLE VOTE. THEIR VOTE COUNTS SAME AS YOURS..............