Fill in the blank ( the ??? ) for this excel spreadsheet

B28 C D . 1 Chapter 6: Applying Excel 2 3 Data 4 Unit sales 5 Selling price per unit 6 Variable expenses per unit 7 Fixed expenses 20,000 units $60 per unit $45 per unit $240,000 ? per unit ? per unit ? per unit 9 Enter a formula into each of the cells marked with a ? below 10 Review Problem: CVP Relationships 11 12 Compute the CM ratio and variable expense ratio 13 Selling price per unit 14 Variable expenses per unit 15 Contribution margin per unit 16 17 CM ratio 18 Variable expense ratio 19 20 Compute the break-even 21 Break-even in unit sales 22 Break-even in dollar sales 23 24 Compute the margin of safety 25 Margin of safety in dollars 26 Margin of safety percentage 27 28 Compute the degree of operating leverage 29 Sales 30 Variable expenses 31 Contribution margin 32 Fixed expenses 33 Net operating income ? units ? 34 35 Degree of operating leverage 36 37