I. On March 1, 2020, Jimena borrowed $6,000 from Rodrigo to help her buy a car. Jimena signed an agreement in which she promised to pay back the money ($6,000) to Rodrigo on March 1, 2021. When the due date arrived, Jimena was unable to pay the full $6,000. (a) On March 1, 2021, Jimena telephoned Rodrigo and told him that she did not have the full $6,000 and asked if he would agree to accept $5,500 as full payment instead. Rodrigo said, "Yes, of course, I agree to accept $5,500 as full payment of the money you owe me." Jimena paid Rodrigo $5,500. Later, Rodrigo sued her for what he claimed as the remaining $500 owed to him. Who wins the lawsuit? Explain fully. (b) Instead of the events in part (a) above, Jimena telephoned Rodrigo on March 1, 2021 and said that she did not have the full $6,000 but that she was willing and able to pay him $5,500 and, in addition, would help him try to get a job in her father's company. Rodrigo orally agreed that this would discharge the entire debt. The next day, Jimena sent Rodrigo $5,500 and telephoned her father, asking him to interview Rodrigo for a job opening at this company. Her father interviewed Rodrigo but rejected him for the job opening. Rodrigo then sued Jimena for $500. Who wins the lawsuit? Explain fully.