Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for H76 are as follows: a. Assuming a perpetual inventory system and using the weighted average method, determine the weighted average unit cost after the July 23 purchase. $ per unit b. Assuming a perpetual inventory system and using the weighted average method, determine the cost of the merchandise sold on July 26. $ c. Assuming a perpetual inventory system and using the weighted average method, determine the inventory on July 31. $ Beginning inventory, purchases, and sales for Item PK95 are as follows: Assuming a perpetual inventory system and using the last-in, first-out (LIFO) method, determine (a) the cost of merchandise sold on July 21 and (b) the inventory on July 31