Roger hires Shelli to build a garage for Roger, for $60,000.Roger needs the garage completed no later than December 1, 2019, because he is leaving then for a 3-month trip to Africa, and needs to have his antique car inside during the winter! Roger writes a special clause that states:

"If Shelli does not complete the garage by December 1, 2019, then Roger will only have to pay $50,000 to Shelli for the garage."