Perpetual Inventory Using LIFO Beginning inventory, purchases, and sales for Item Gidget are as follows: Sept. 1 Inventory 80 units at $175 10 Sale 65 units 18 Purchase 75 units at $180 27 Sale 70 units Assuming a perpetual inventory system and using the last-in, first-out (LIFO) method, determine (a) the cost of merchandise sold on September 27 and (b) inventory on September 30. a. Cost of merchandise sold on September 27 $ X b. Inventory on September 30