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 $ 45,000 31,560 13,500 8,640 $4,860 7. If the variable cost per unit increases by $1. spending on advertising increases by $1,350, and unit sales increase by 170 units, what would be the net operating income? Net operating income