How do I solve for CM ratio, the break-even and margin of safety?

Unit 3 Application Assignment Chapter 5: Applying Excel Data Unit sales Selling price per unit Variable expenses per unit Fixed expenses 20,000 units $60 per unit $45 per unit $240,000 Enter a formula into each of the cells marked with a 7 below. Be sure to format the cells appropriatey. For example, if the cell has a dollar amount in it, then the cell should be formatted for dollars. Review Problem: CVP Relationships Compute the CM ratio Selling price per unit Variable expenses per unit Contribution margin per unit $60 per unit $45 per unit ? per unit CM ratio ? Compute the break-even Break-even in unit sales Break-even in dollar sales ? units ? Compute the margin of safety Margin of safety in dollars Margin of safety percentage