Ar ER, PARTIAL CREDIT MAY BE AWARDED SO SHOW YOUR WORK 36) Zaccaria Corpo situations that are within the relevant range. ration has provided the following contribution format income statement. All questions concern Sales (5,000 units) Variable expenses $300,000 240,000 60,000 Contribution margin Fixed expenses Net operating income Required: a. What is the contribution margin ratio? b. If sales increase to 5,040 units, what would be the C. If the selling price increases by $4 per unit and the sales volume decreases by 400 units, what would be the estimate estimated increase in net operating income? net operating income? d. What is the break-even point in unit sales? e. What is the margin of safety in dollars