Grouper Windows manufactures and sells custom storm windows for three-season porches. Grouper 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. Grouper enters into the following contract on July 1, 2020, with a local homeowner. The customer purchases windows for a price of $2,470 and chooses Grouper to do the installation. Grouper charges the same price for the windows irrespective of whether it does the installation or not. The customer pays Grouper $1,940 (which equals the standalone selling price of the windows, which have a cost of $1,050 ) upon delivery and the remaining balance upon installation of the windows. The windows are delivered on September 1, 2020, Grouper completes installation on October 15, 2020, and the customer pays the balance due. (a) Your answer is partially correct. Grouper estimates the standalone selling price of the installation based on an estimated cost of $450 plus a margin of 305 on cost. Prepare the journal entries for Grouper in 2020. (Credit account tities are outomatically indented when the amount is entered. Do not Indent manually. if no entry is required, select "No entry" for the occount tities and enter Ofor the amounts. Round answer to 0 decimal places, es. 5.125)