Marginal corporate tax rates. Using the corporate tax rate schedule given here, perform the following: a. Find the marginal tax rate for the following levels of corporate earnings before taxes: $ 14, 200; $ 60, 900; $ 88, 600; $ 205, 000; $ 403, 000; $ 1.4 million; and; $ 20.4 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. a. The marginal tax rate for earnings before taxes of $ 14, 200 is [ ]