Required information (The following information applies to the questions displayed below) 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 Contribution margin Fixed expenses Net operating income $ 20,000 12,000 8.000 6.000 $ 2,000 4. If sales increase to 1,001 units, what would be the increase in net operating income? increase in rotopening