Question: Mental Incompetence. Joanne is a seventy-five-year-old widow who survives on her husband's small pension. Joanne has become increasingly forgetful, and her family worries that she may have Alzheimer's disease (a brain disorder that seriously affects a person's ability to carry out daily activities). No physician has diagnosed her, however, and no court has ruled on Joanne's legal competence. One day while out shopping, Joanne stops by a store that is having a sale on pianos and enters into a fifteen-year installment contract to buy a grand piano. When the piano arrives the next day, Joanne seems confused and repeatedly asks the deliveryperson why a piano is being delivered. Joanne claims that she does not recall buying a piano. Explain whether this contract is void, voidable, or valid. Can Joanne avoid her contractual obligation to buy the piano? If so, how?