Tammy Fay is an old lady. She just had her 85th birthday last month.She is for the most party healthy but forgets things from time to time and needs the support of her granddaughters occasionally.Tammy one morning decides to go for a walk and finds a nice little video game store on the corner.She wanders into the store and see many young folks playing the games.She then intimates to the clerk that she would like to take lessons to learn the games.The clerks gives Tammy the usual 15 minute tutorial and then quotes her the prices for playing the games.Tammy indicates that she would like to have more lessons so that she can win the contest that is being advertised on the wall.The clerk, Toby, indicates that he can give Tammy lessons for $4000 over the next two weeks.Tammy agrees and writes a check.Tammy then leaves an never returns.Her granddaughters do return and demand the money returned. Under what theory can the daughters recover the money and will they be successful?