Number 2 and 3 are the problems I need to learn the work for.

Below is a contribution format income statement for BlueBell Corporation. Record your final answer on the blank line. Sales (5,000 units) 300,000 Variable expenses 240,000 Contribution margin 60,000 Fixed expenses 58,800 Net operating income 1,200 1. What is the contribution margin ratio? 2. If sales increases 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 margin of safety in dollars