Whispering Company uses a periodic inventory system. For April, when the company sold 500 units, the following information is available. Units Unit Cost Total Cost April 1 inventory 320 $21 $ 6,720 April 15 purchase 400 25 10,000 April 23 purchase 280 27 7,560 1,000 $24,280 Compute the April 30 inventory and the April cost of goods sold using the LIFO method., Ending inventory $ Cost of goods sold $