Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for Meta-B1 are as follows: 100 units at $400 70 units 120 units at $450 110 units July 1 Inventory 12 Sale 23 Purchase 26 Sale 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. Assuming a perpetual inventory system and using the weighted average method, determine the Inventory on July 31