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 8. What is the break-even point in unit sales? Break-even point units 9. What is the break-even point in dollar sales? Break-even point