Oslo Company prepared the following contribution format income statement based on a sales volume of 1,000 units (the relevant range of production is 500 units to 1,500 units): Sales Variable expenses $ 20,000 12,000 Contribution margin 8,000 Fixed expenses 6,000 Net operating income $ 2,000 Required: If sales declined to 900 units, what would be the net operating income? Net operating income $ 1,200