Routsong Company had the following sales and production data for the past four years: Production units Sales units Year 1 6,000 Year 2 Year 3 Year 4 9,000 4,000 5,000 6,000 6,000 5,000 7,000 Selling price per unit, variable cost per unit, and total fixed cost are the same in each year. The total net operating income for all four years combined would not be the same under variable and absorption costing.