Mike the mechanic inspected Millie's car and agreed to fix it for the flat fee of $2,000. After beginning the project, Mike realized that it would take more time than he originally thought and he could not complete the job and make a profit. Mike demanded $2,500 to complete the same repair. Millie promissed to pay the extra $500. When the project was complete, Millie tendered $2,000 to Mike for the job. If Mike sues Millie for the remaining $500 : Mike will win because they had a deal for the additional $500. Mike will win because Millie had a pre-existing duty to pay any additional amounts. Mike will lose because there was no legal consideration to support the additiona $500. Mike will lose because the UCC does not require consideration to modify an existing contract