Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for WCS12 are as follows: Oct.1. Inventory 300 units at $11 132229SalePurchaseSale180units380unitsat$12300units a. Assuming a perpetual inventory system and using the weighted average method, determine the weighted average unit cost after the Octioter 22 . b. Assuming a perpetual inventory system and using the weighted averape method, determine the cost of goods sold on Dciober 29 : Pound your "average unit cost" to two decimal places. C. Assuming a perpetual inventory system and using the weighted ayerage method, defermine the inventory on October 31 . Round your "average unit. cost to two decimal places