Perpetual Inventory Using FIFO August 1 Inventory 50 units at $80 9 Sale 30 units 13 Purchase 40 units at $85 28 Sale 25 units Beginning inventory, purchases, and sales for Item B901 are as follows: Assuming a perpetual inventory system and using the first-in, first-out (FIFO) method, determine (a) the cost of merchandise sold on August 28 and (b) the inventory on August 31.