I was in the Post Office earlier today to send off an item. The official behind the desk advised that the cost of postage was 82 cent so I handed her a €5 note in payment.
She pulled out a calculator to figure out how much the change should be.
I would be embarrassed if my 9yo son couldn't do that in his head, let alone an adult who deals in hundreds of such transactions every day.

She pulled out a calculator to figure out how much the change should be.
I would be embarrassed if my 9yo son couldn't do that in his head, let alone an adult who deals in hundreds of such transactions every day.