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P1-8 Marginal tax rates Using the tax rate schedule given in Table 1.2, perform the following: a. Find the marginal tax rate for the following levels of sole proprietorship earnings before taxes: $15,000;$60,000; $90,000;$150,000;$250,000;$450,000; and $1 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. Table 1.22020 Federal Tax Rates for Individual and Joint Taxpayers