PE 7-3A Perpetual inventory using LIFO OBJ. 3 Beginning inventory, purchases, and sales for Item FK7 are as follows: Sept. 1 Inventory 115 units at $255 10 Sale 100 units 18 Purchase 110 units at $260 27 Sale 105 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) the inventory on September 30