Moving to the next question pres 10 points Savec Question 9 Erving Company had a beginning inventory of 600 units at a cost of $8 per unit on August 1. During the month, the following purchases and sales were made. The selling price is foed at $ 15 per unit Purchases Sales Aug 6400 units at $0 Aug 9 400 units 17 800 units at 58 Aug 13 500 units Aug Aug 22 200 units at $10 Aug Aug 19 600 units 26 300 units Erving uses a periodic inventory system Required Determine ending inventory, cost of goods sold and gross profit under (1) average cost. (2) FIFO, and (3) LIFO (clear computation is required to earn full marks)