Joon and Ahmad signed a contract. Joon was contracted to build a Treehouse in Ahmad's backyard. According to the contract, Ahmad would pay $20,000 to Joon on completion of the Treehouse. Also, the treehouse must include two windows and a door. On Monday, Ahmad noticed that Joon completed the carpentry but failed to install the door as per the contract.

On Tuesday, Ahmad sent Joon a text message to ask Joon when he was coming back to finish installing the door of the Treehouse. On Wednesday, Ahmed texted Joon again but did not hear from Joon. On Friday, Joon texted Ahmed to tell him to pay $20,000 via INTERAC e-transfer. On Sunday, Ahmad paid Ben $1,000 to install the door of the Treehouse. Ahmed was furious and did not want to pay Joon anything.

Required:
1) Discuss the rights and duties of Joon and Ahmed. Define or explain any legal terms and concepts that you use.