I am stuck with these questions, can you please explain. Thank you!

Average-Cost Method: Perpetual Inventory System Assume the following data with regard to inventory for Vegan Company: Aug. 1 Inventory 40 units @ $10 per unit $ 400 8 Purchase 22 Purchase Goods available for sale 50 units @ $11 per unit 35 units @ $12 per unit 125 units Aug. 15 Sale 45 units 28 Sale 25 units Inventory, Aug. 31 550 420 $1,370 55 units Calculate the cost of ending inventory and cost of goods sold according to the average-cost method under the perpetual inventory system. In your calculations round average unit cost to the nearest cent and round all other calculations and your final answers to the nearest dollar. Average-Cost Method Cost of ending inventory: Cost of goods sold: $ $ FIFO Method: Perpetual Inventory System Assume the following data with regard to inventory for Vegan Company: Aug. 1 Inventory 40 units @ $10 per unit $ 400 8 Purchase 22 Purchase Goods available for sale 50 units @ $11 per unit 35 units @ $12 per unit 125 units Aug. 15 Sale 45 units 28 Sale 25 units Inventory, Aug. 31 550 420 $1,370 55 units Calculate the cost of ending inventory and cost of goods sold according to the FIFO method under the perpetual inventory system. FIFO Method Cost of ending inventory: Cost of goods sold: $ $ LIFO Method: Perpetual Inventory System Assume the following data with regard to inventory for Vegan Company: Aug. 1 Inventory 40 units @ $10 per unit $ 400 8 Purchase 50 units @ $11 per unit 550 22 Purchase 35 units @ $12 per unit 420 Goods available for sale 125 units $1,370 Aug. 15 Sale 45 units 28 Sale 25 units Inventory, Aug. 31 55 units Calculate the cost of ending inventory and cost of goods sold according to the LIFO method under the perpetual inventory system. LIFO Method Cost of ending inventory: Cost of goods sold: $ $