Having some trouble. Please explain the answer. Thanks.

Altira Corporation provides the following information related to its merchandise inventory during the month of August 2021:

Aug.1	Inventory on hand3,600 units; cost $7.70 each.
8	Purchased 18,000 units for $7.10 each.
14	Sold 14,400 units for $13.60 each.
18	Purchased 10,800 units for $6.60 each.
25	Sold 13,400 units for $12.60 each.
28	Purchased 5,600 units for $5.80 each.
31	Inventory on hand10,200 units.

2. Using calculations based on a perpetual inventory system, determine the inventory balance Altira would report in its August 31, 2021, balance sheet and the cost of goods sold it would report in its August 2021 income statement using the Average cost method. (Round "Average Cost per Unit" to 2 decimal places.)

Perpetual Average	Inventory on hand			Cost of Goods Sold			Inventory Balance
	# of units	Cost per unit	Inventory Value	# of units sold	Avg.Cost per unit	Cost of Goods Sold	# of units in ending inventory	Cost per unit	Ending inventory
Beginning Inventory
Purchase - August 8
							0		$0
Sale - August 14
Purchase - August 18
							0		$0
Sale - August 25
Purchase - August 28
Total	0		$0			$0	0		$0