Shawna, a high school senior, agrees to babysit for her nextdoor neighbor's children every Tuesday evening from 5-8pm in exchange for $20 per hour until she leaves for college. Part of their agreement includes that Shawna will take the children to the playground in the park in their neighborhood for at least 30 minutes after dinner (which they eat at 6pm) to tire them out before bedtime.

Shawna continues to take care of the children for the remainder of her senior year and into the summer. One evening, a police officer comes up to Shawna in the park during the kids' time in the playground and issues her a ticket since the park closes at 5pm. The fine is over $200 - upset and frustrated, Shawna informs her neighbors when they get home that night that she is cancelling their agreement immediately - she's not interested in getting any more tickets, and she wants to be able to enjoy the big 18th birthday celebration that her friends have planned for her (her birthday is the following weekend). 

 

(1) Does a contract exist between Shawna and her neighbors? Why/why not?

(2) Can Shawna cancel/revoke/terminate it? Why/why not?