A fumiture manufacturer specializes in wood tables. The tables sell for $160 per unit and incur $72 per unit in variable costs. The company has $14,960 in fixed costs per month. Expected sales are 420 tables per month. 17. Calculate the margin of safety in units. 18. Determine the degree of operating leverage. Use expected sales. 19. The company begins manufacturing wood chairs to match the tables. Chairs sell for $70 each and have variable costs of $40. The new production process increases fixed costs to $17,260 per month. The expected sales mix is one table for every four chairs. Calculate the breakeven point in units for each product. 17. Calculate the margin of safety in units. Begin by selecting the formula labels and entering the amounts to compute the number of table the company must sell to break even. (Abbreviation used: CM= contribution margin. Complete all input fields. For items with a zero value, enter "O