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 $ 10,000 5,500 4,500 2,250 $2,250 7. If the variable cost per unit increases by $1. spending on advertising increases by $1,000, and unit sales increase by 100 units, what would be the net operating income? Net operating income