6. 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): $21,500 Sales Variable expenses Contribution margin Fixed expenses 9,000 7,200 Net operating income S 1,800 Required If the selling price increases by $2.50 per unit and the sales volume decreases by 100 units, what would be the net operating income? (Do not round intermediate calculations.) Net operating income