John and sam signed a contract. John was contracted to build a Gazebo in sam's backyard. According to the contract, sam would pay $7,000 to John on completion. On Monday, sam noticed that John completed the carpentry but failed to finish applying a coat of paint as per the agreement. On Tuesday, sam sent John a text message to ask John when he was coming back to finish painting the Gazebo. On Wednesday, John texted sam to inform sam that he would not come back to paint and demanded sam to pay him $7,000. On Thursday, sam paid Bob $700 to paint the Gazebo. sam was furious and did not want to pay John anything. Discuss the rights and duties of John and sam. Define or explain any legal terms and concepts that you use.

Hint: Chapter 14.