Used to be the cashier would count back your change.
Then is was they had to have the register show them how much change to give.
Then they rely on people to use debit and credit cards so it doesn't matter.
Now they get confused and annoyed when someone uses cash.

Next time, I'm using cash and adding a few extra coins and watch the implosion.

For even when we were with you, we gave you this rule: "If a man will not work, he shall not eat."

2 Thessalonians 3:10