Marginal corporate tax rates Using the corporate tax rate schedule given here LOADING... , perform the following: a. Find the marginal tax rate for the following levels of corporate earnings before taxes: $ 13 comma 000 ; $ 61 comma 200 ; $ 91 comma 100 ; $ 197 comma 000 ; $ 400 comma 000 ; $ 1.4 million; and $ 19.7 million. b. Plot the marginal tax rates (measured on the y axis) against the pretax income levels (measured on the x axis). Explain the relationship between these variables.