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 $ 25,000 Variable expenses 17,500 Contribution margin 7,500 Fixed expenses 4,200 Net operating income $ 3,300

4. If sales increase to 1,001 units, what would be the increase in net operating income?