Harry and wilma were divorced in 2008, and harry was ordered in the divorce decree to pay his ex-wife$10,000. in 2009 and 2010 harry was hospitalized, incurring $3,000 in bills. he and wilma discussed the matter, and wilma agreed to pay the bill with her own money, even though harry still owed her $5,000 from the divorce decree. when harry died in late 2010, wilma made a claim against his estate for $8,000(the $3,000 in medical bills and the $5,000 from the decree), but the estate was only willing to pay the$5,000 from the decree, claiming she had paid the hospital bill voluntarily and had no contract for repayment. is the estate correct? explain.