Perpetual Inventory Using Weighted Average Beginning Inventory, purchases, and sales for WCS12 are as follows: Oct. 1 Inventory 300 units at $15 13 Sale 200 units 22 Purchase 400 units at $16 29 Sale 200 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. $ 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