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 un cost after the October 22 purchase. Round your answer to two decimal places. per unit b. Assuming a perpetual inventory system and using the welghted average method, determine the cost of goods sald on October 29 . Round your "average unit cost" to two decimal places. c. Assuming a perpetual inventory system and using the welghted average method, determine the inventory on October 31 . Round your "average unit cost" to two decimal places