Boardwalk Construction is working on a small renovation project for Capone at his home. There is no written contract, but the two have orally agreed that Boardwalk will renovate Capone's garage for $75,000. The two have agreed that construction is to be completed within one month. Two weeks later, Boardwalk approaches Capone and complains that the cost of nails has increased by 40% and that the cold weather has slowed the construction project. Boardwalk and Capone agree to increase the contact by $5,000 and to extend the completion date by three weeks. Each party agrees in writing to this change. Upon completion of the project, Boardwalk sends Capone a bill for $80,000.

3. How much does Capone have to pay? What are the competing arguments?