Professor Green also tells Helen the following: 1. Don't sell, under any circumstances, my two books on agency law because I can never remember all the silly rules. 2. Don't stand on the chair because it's broken. Hypo 1. Helen sells a corporate book for $25.00. Professor Green has forgotten to tell Helen that he also doesn't want her to sell his contracts books. Can he get it back? Hypo 2. Helen takes a second customer into the office and shows her the book selection. However, the dust on the books is so bad that the customer has an asthma attack and runs out. Helen hires someone to come in and clean the books and runs a bill of $25.00. Does Professor Green have to pay the bill? Hypo 3. Helen takes a customer into the office and is offered $1,000.00 for the agency book. She is excited about the amount and, forgetting what Professor Green told her, sells it to the customer. Can Professor Green get it back? Hypo 4. Helen sells Professor Green's old corporations book for $5.00 and, getting angry, he demands that the customer return the book. Can he get it back? Hypo 5. Helen steps on the chair to reach for a law book to sell it and injures herself. Can she recover any damages for her injury from Professor Green