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 $ 50,000 Variable expenses 27,500 Contribution margin 22,500 Fixed expenses 14,850 Net operating income $ 7,650 7. If the variable cost per unit increases by $1, spending on advertising increases by $1,400, and unit sales increase by 180 units, what would be the net operating income?