ben met jane at a singles bar. after they enjoyed several cocktails, jane mentioned that she was a law student and that she was upset because she could not afford law books. ben coincidentally, was an upper classman at the same law school. jane was impressed. after a few more drinks, ben told jane that he would give her all the books she needed. the next day ben arrived at jane's house, and to his surprise , jane was married. he gave the books to jane stating here are the books you ordered. ben then went home and later demanded $100, the price of the used books. it is important to note that an advertisement by ben appeared in the law school paper which stated: first year law books for sale -$100. jane had read the advertisement several days before the encounter with ben and she knew who ben was. WHAT ARE THE RIGHTS AND LIABILITIES OF THE PARTIES? DOES A CONTRACT EXIST? EXPLAIN.