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 $2,370 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 $2,050 (which equals the standalone selling price of the windows, which have a cost of $1,140) 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. Given uncertainty of finding skilled labor, Martinez is unable to develop a reliable estimate for the standalone selling price of the installation. 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 for the amounts.) Date Account Titles and Explanation Debit Credit Sep. 1, 2020 Cash 2050 Accounts Receivable 320 Unearned Service Revenue Sales Revenue (To record sales) Cost of Goods Sold 1140 Inventory 1140 (To record cost of goods sold) Oct. 15, 2020 Cash 320 Unearned Service Revenue Service Revenue ta Accounts Receivable 320 (To record payment received)