Perpetual Inventory Using LIFO Beginning inventory, purchases, and sales for Item Zebra 9x are as follows: April 1 Inventory 420 units at $8 10 Sale 300 units 18 Purchase 280 units at $9 27 Sale 250 units Assuming a perpetual inventory system and using the last-in, first-out (LIFO) method, determine (a) the cost of merchandise sold on April 27 and (b) the inventory on April 30. a. Cost of merchandise sold on April 27 II b. Inventory on April 30