A madam in gorgeous dress went into a up-scale shop one day.The shop assistant went up to greet the guest.Sally asked the madam what she was interested in.The madam looked at Sally disdainfully and said," Look your miserable and shabby appearance.Persons like you are not qualified to serve me." Sally and her friends are very angry.They decided to give the madam a lesson.They raised the price by 500 yuan for the commodity the madam bought.