Problem# 3 (10 points) Sattler Corporation has provided the following contribution format income statement. All questions concer situations that are within the relevant range. Sales (8,000 units) Variable expenses Contribution margin Fixed expenses Net operating income $480,000 336,000 144,000 142.200 $1,800 Required: a. What is the contribution margin per unit? b. What is the variable expense ratio? c. If sales decline to 7,900 units, what would be the estimated net operating income? d. If the variable cost per unit increases by $5, spending on advertising increases by $2,000, and unit sales increase by 3,400 units, what would be the estimated net operating income? e. What is the break-even point in dollar sales