Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for WCS 12 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 Jour answer to two decimal places. X per unit b. Assumino 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