Determines illegal business practice in each of the following situations:
a) Alain receives a flyer advertising leather boots, the price of which is reduced by 70%. When it arrives at the store, there is only one pair left, small in size.
b) Gina reads an ad on a 10 karat gold chain. She only costs $10 and decides to send the payment. When she receives the package at home, she realizes that the chain is not gold.
c) Paul is driving across town to a store offering a 30-50% discount on stereo equipment. When he arrived at the store, he was told that there was only one model on sale and that they were all sold out yesterday.