Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for WCS12 are as follows: Oct. 1 Inventory 320 units at $10 13 Sale 160 units 22 Purchase 340 units at $13 29 Sale 300 units a. Assuming a perpetual inventory system and using the weighted average method, determine the weighted average unit cost after the October 22 purchase. 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 unit cost to two decimal places. $ C. 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. $