Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for 3101 are as follows: Oct. 1 Inventory 480 units at $14 13 Sale 280 units 22 Purchase 600 units at $16 29 Sale 450 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 the merchandise 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.