Bob's Construction, contracts with Drump Investment Company to build a Wacky Food Burger Joint near Blaster Beach. The work is to begin on June 1 and be done by July 1, so that the stand can open for the end of the summer. Bob's Construction does not finish until September 1. The Joint opens but Drump Investment loses several weeks' early summer sales due to the delay. Is Drump's Investment's duty to pay for the construction of the stand discharged?