Oslo Company prepared the following contribution format income statement based on a sales volume of ,000 units (the relevant range of production is 500 units to 1,500 units): Sales Variable expenses Contribution margin Fixed expenses $100,000 65,000 35,000 30,100 $ 4,900 Net operating income 1. What is the contribution margin per unit? (Round your answer to 2 decimal places.) Contribution margin per unit 3. What is the variable expense ratio? Variable expense ratic 5. If sales decline to 900 units, what would be the net operating income? Net operating income 7. If the variable cost per unit increases by $1, spending on advertising increases by $1,900, and unit sales increase by 280 units, what would be the net operating income? Net operating income