Martinez Windows manufactures and sells custom storm windows for three-season porches. Martinez also provides installation service for the windows. The installation process does not involve changes in the windows, so this service can be performed by other vendors. Martinez enters into the following contract on July 1, 2020, with a local homeowner. The customer purchases windows for a price of $ 2,490 and chooses Martinez to do the installation. Martinez charges the same price for the windows irrespective of whether it does the installation or not. The customer pays Martinez $ 1,950 (which equals the standalone selling price of the windows, which have a cost of $ 1,110) upon delivery and the remaining balance upon installation of the windows. The windows are delivered on September 1, 2020, Martinez completes installation on October 15, 2020, and the customer pays the balance due. Martinez estimates the standalone selling price of the installation based on an estimated cost of $ 430 plus a margin of 10% on cost. Prepare the journal entries for Martinez in 2020. (Credit account titles are automatically indented when the amount is entered. Do not indent manually. If no entry is required, select "No entry" for the account titles and enter O for the amounts. Round answer to O decimal places, e.g. 5,125.) Date Account Titles and Explanation Debit Credit Jul 1, 2020 No Entry No Entry (To record contract entered into) Sep. 1, 2020 Cash Accounts Receivable Unearned Service Revenue Sales Revenue (To record sales) Cost of Goods Sold Inventory (To record cost of goods sold) Oct. 15, 2020 Cash Unearned Service Revenue Service Revenue Accounts Receivable (To record payment received)