Beginning inventory, purchases, and sales for WCS12 are as follows: Oct, 1 inventory 125 units at $8.00, Oct 13 Sale 175 units, Oct 22 Purchases 375 units, Oct 29 Sale 280 units. assuming a perpetual inventory system and using the weighted average method, determine (A) the weighted average unit cost after the Oct 22 purchase, (B) the cost of goods sold on Oct 29, and (C) the inventory on Oct 31.