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 13,000 7,000 3,780 $ 3,220 7. If the variable cost per unit increases by $1, spending on advertising increases by $1,100, and unit sales increase by 120 units, what would be the net operating income? Net operating income