Perpetual inventory using weighted average Beginning inventory, purchases, and sales for WCS12 are as follows: 350 units at $14 160 units Oct. 1 13 Inventory Sale 22 Purchase 29 Sale 310 units at $15 300 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. 14.86 X 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. 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.