A. Compute the missing amounts in the income statement under three different inventory costing methods: (Ignore income taxes.)

	FIFO	LIFO	Average Cost
Sales revenue (3,000 units)	$90,000	$90,000	$90,000
Cost of goods sold: Beginning inventory (1,000 units @ $10 per unit)	10,000	10,000	10,000
Purchases (4,000 units @ $12 per unit)	(1)	(7)	(13)
Goods available for sale	(2)	(8)	(14)
Ending inventory (2,000 units)	(3)	(9)	(15)
Cost of goods sold	(4)	(10)	(16)
Gross profit	(5)	(11)	(17)
Operating expenses	20,000	20,000	20,000
Net operating income (pretax)	(6)	(12)	(18)