Perpetual Inventory Using LIFO Beginning inventory, purchases, and sales for Item C283 are as follows: March 1 Inventory 98 units $17 5 Sale 78 units 11 Purchase 109 units $21 21 Sale 92 units Assuming a perpetual inventory system and using the last in, first-out (LIFO) method, determine (a) the cost of merchandise sold on March 21 and (b) the inventory on March 31. a. Cost of merchandise sold on March 21 b. Inventory on March 31