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 $ 26,000 14,000 Contribution margin Fixed expenses 12,000 7,500 Net operating income $ 4,200 7. If the variable cost per unit increases by $ 50. spending on advertising increases by $1,000, and unit sales increase by 250 units, what would be the net operating income? (Do not round intermediate calculations.) Net operating income