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 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 averoge method, determine the cost of goods sold on October 29 . Round your "average unit cost" to two decimal pioces. c. Assuming a perpetual inventory system and using the weighted overage method, determine the inventory on Qctober 31 , Round your "ovarage unit cost", to two decimal piaces