Please show all work/formulas!!

Income statements for Siam Foods, Inc. from 2018 to 2020 appear below. a. Enter the data into your worksheet and calculate the degree of operating leverage for each year. b. Calculate the degree of financial leverage for each year. c. Calculate the degree of combined leverage for each of the three years. Does it appear that Siam Food's leverage measures have been increasing or decreasing over this period? d. Create a line chart that shows how the various leverage measures have changed over this three-year period