Required information [The following information applies to the questions displayed below.] Jorgansen Lighting, Inc., manufactures heavy-duty street lighting systems for municipalities. The company uses variable costing for internal management reports and absorption costing for external reports to shareholders, creditors, and the government. The company has provided the following data: Inventories Beginning (units) Ending (units) Variable costing net operating income Year 1 Year 2 Year 3 210 170 170 190 $290,000 190 $279,000 240 $260,000 The company's fixed manufacturing overhead per unit was constant at $570 for all three years.