I own a shop with lets say bob, im out on my lunch and 3 of my friends come in to buy a ball 0.o cos im out bob serves them the ball costs £30 and the go in £10 each.
I come back off lunch and bob tells me he sold a ball to them for £30 so i tell him he should of given them discount coz there friends and im a nice kinda person

so i give bob £5 and tell him to go give it back, so off goes bob, on the way he thinks to himself they all chipped in for it and £5 cnt be split between the 3 of them equally so he takes £2 out for himself and gives my friends £1 each back.
ok so in all my mates spent £9 each yeah
9x3=27 + the £2 bob took out thats only £29 where the other £1 0.o