eBook Show Me How Calculato Beginning inventory, purchases, and sales for Item ER27 are as follows: 102 units $15 82 units 113 units $18 95 units March 1 Inventory 5 Sale 11 Purchase 21 Sale Assuming a perpetual inventory system and using the last-in, first-out (LIFO) method, determine (a) the cost of merchandise 21 and (b) the inventory on March 31. a. Cost of merchandise sold on March 21 b. Inventory on March 31