3 guys sharing a flat decide to buy a second hand TV. They each put in �10 and get one for �30. The TV salesman tells his boss who informs him that the TV was actually priced at �25 and to give them a �5 refund. The salesman finds the 3 guys and offers them 5 �1 coins back. They're impressed and take only a �1 coin each and tell the salesman to keep the other two as a tip. That means the 3 guys ended up paying only �9 each and three times nine plus two equals 29.....so what happened to the last pound coin?
Not sure where the �9.33 comes from. They did each spend �9 (10 minus 1) totalling �27, made up of the �25 the boss kept and the �2 they returned - adding the �2 to the �27 is an irrelevancy as it is already in the �27 !