Zanzibar Corporation has provided the following contribution format income statement. All questions concern situations that are within the relevant range Sales (5,000 units) $300,000 Variable expenses 240,000 Contribution margin 60,000 Fixed expenses 58,800 Net operating income $1,200 Required 1. What is the contribution margin ratio? 2. If sales increase to 5,040 units, what would be the estimated increase in net operating income? 3. If the selling price increases by $4 per unit and the sales volume decreases by 400 units, what would be the estimated net operating income? 4. What is the break-even point in unit sales? 5. What is the break-even point in dollar sales? 6. What is the margin of safety in dollars? 7. What is the degree of operating leverage? 8. If Sales increase by 10%, how much is Net Operating Income