Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for WCS12 are as follows: a. Assuming a perpetual inventory system and using the weighted average cost method, determine the weighted average unit cost after the October 22 purchase. $ 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. $