Desert Quest, Inc., sponsors the California Off Road Desert Classic Road Rally with an

advertised prize of $30,000 for first place, $15,000 for second place, and $5,000 for third

place. The rules of the race require all participants to drive and complete the 200 mile desert race first before any prize money will be awarded. Zoey drives and completes the 200 mile race and wins first place. However, Desert Quest only offers Zoey a prize of $15,000 even though she won first place and should have received the $30,000 award. Desert Quest claims it had no contract with Zoey and that it had the right to change the amount of the prize money at any time.

What is the IRAC for the case regarding types of contracts?