3 Guys go to buy a telly
Shopkeeper asks for £30
Guys hand over a tenner each and take telly
Telly only cost £25 really, so the shopkeeper had taken a fiver too much.
Shopkeeper has flash of conscience and decides he cant steal a fiver just 2 quid
Runs out of shop and tells guys he made a mistake and gives them a pound each back
So guys paid £9 each (total £27), and shopkeeper kept £2--- (so thats £29) --wheres the other pound gone?