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, s. 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