Joe Owed Sam $5000

Essay

Joe owed Sam $5000. After the money was due, he approached Sam and told him that he couldn't pay the money, but if Sam was willing to take $3000 that day in full satisfaction of the debt, he could come up with that money. Sam agreed to take the money and, in fact, took the money. Once he had it in his possession, he then turned around and sued Joe for the other $2000. Explain the likely outcome.