Required: 1. Using the data from 2019 in Exhibit 9.1, create an Excel spreadsheet to provide a sensitivity analysis of the effect on operating profit of potential changes in demand for HFI Inc., raging from a 20 percent decrease to 20 percent increase. Use Exhibits 9.2 and 9.6 as a guide. Assume that two-thirds of fixed costs are manufacturing related; the remaining one-third are selling-related. The variable manufacturing cost per unit is $30, while the variable selling cost per unit is $5. (Hint: Calculate the DOL for 2019 at a sales volume of 2,400 units.) (Input your answer as a percentage rounded to 2 decimal places (i. e., 0.1567