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, 2017, with a local homeowner. The customer purchases windows for a price of $2,420 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 installation service is estimated to have a standalone selling price of $600. The customer pays Martinez $1,960 (which equals the standalone selling price of the windows, which have a cost of $1,120) upon delivery and the remaining balance upon installation of the windows. The windows are delivered on September 1, 2017, Martinez completes installation on October 15, 2017, and the customer pays the balance due. Prepare the journal entries for Martinez in 2017. (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, 2017 (To record contract entered into) Sep. 1, 2017 (To record sales) (To record cost of goods sold) Sep. 1, 2017 (To record sales) (To record cost of goods sold) Oct. 15, 2017