Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for WCS12 are as follows: Oct. 1 Inventory 320 units at $13 13 Sale 190 units 22 Purchase 370 units at $16 29 Sale 400 units a. Assuming a perpetual inventory system and using the weighted average method, determine answer to two decimal places. $ 15.22 per unit weighted average unit cost after the October 22 purchase. Round your 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. $ 2,660 X c. Assuming perpetual inventory system and using the weighted average method, determine the inventory on October 31. Round your average unit cost to two decimal places. $ 2,090 x Check My Work When the average cost method is used in a perpetual inventory system, an average unit cost for each item is computed each time a purchase is made. This unit cost is used to determine the cost of each sale until another purchase is made and a new average is computed