Oslo Company prepared the following contribution format income statement based on a sales volume of 1000 units (the relevant range of production is 500 units to 1,500 units): $ Sales Variable expenses Contribution margin Fixed expenses Net operating income 25,100 13,700 11,400 7,752 3,648 $ Required: If sales declined to 900 units, what would be the net operating income? (Do not round intermediate calculations.) Net operating income