Name Bireen Daors manufactures and selis custom folding doors for enclosed porches. Green also provides instaliation service for the doors. The installation process does not involve changes in the doors, so this service can be provided by other vendors Green enters into the following contract on May 1, 2023, with a local homeowner. The customar purchases a Goor for a price of $7.500 and chooses Green to do the installation. Green charges the same price for the doors irrespective of whether it does the installation or not. The price of the installation service is estimated to have a fair value of $1,000. The customer pays Green $5,000 upon delivery of the door (which equals the fair value of the door, the cost of the door is $3,500 ). The remaining balance of $2,500 is paid upon completion of the installation of the doors. The door is delivered on July 1, 2023. Green completes installation on August 15, 2023