Please explain part b I don't understand how to get the carrying value of the reporting unit in order to determine impairment? Why do you only consider common stock and retained earnings? I thought you have to consider the book/carrying value of net assets

Shaquille Company pays $1,575,000 to acquire 100% of the common stock of Gaskin The following information is available 1 year after the acquisition of the subsidiary Incorporated. It assumes that Gaskin's plant assets (such as the factory building and company (i.e., the reporting unit): land) are undervalued by $50,000. The historical cost of the net assets acquired, (Cick the icon to view the balance sheet.) excluding goodwill, is equal to $1,504,500. Gaskin will be held as a division of Shaquille. Shaquille estimated the fair (appraisal) value of the division's net assets (excluding goodwill) 1 year after the date of acquisition at $1,610,000. i Data Table X i Requirements X Description Debit Credit a. Compute goodwill recorded on the date of acquisition. Cash b. Determine whether goodwill is impaired assuming that the fair value of the $ 209,000 Gaskin Division with goodwill 1 year after acquisition is equal to $2,008,000. Inventory 303,000 Provide the impairment journal entry, if needed. Property, plant, and equipment, net 1,499,400 c. Determine whether goodwill is impaired assuming that the fair value of the Gaskin Division with goodwill 1 year after acquisition is equal to $1,618,500. Goodwill 20,500 Prepare the impairment journal entry, if needed. Current liabilities $ 401,000 Common stock - no par 340,900 Print Done Retained earnings 1,290,000 Totals $ 2,031,900 $ 2,031,900