Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for WCSI2 are as follows: Oct. Inventory 320 units at $10 13 Sale 180 22 Purchase 300 units $12 300 units a. Assuming a perpetual inventory system and using the weighted wage method, determine the weighted average unit cost after the October 22 perchase, Round your answer to two decimal places per unit b. Assuming a perpetual inventory system and using the weighted average method, determine the cost of goods sold on October 29. Round your average cost to two decimal places. Assuming a perpetual inventory system and using the weighted average method, determine the inventory on October 31. Round your average unit cost to two decimal places