Timmy Tappan is single and had $189,000 in taxable income. Using the rates from Table 2.3:in the chapter, calculate his income taxes. a. What is the average tax rate? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What is the marginal tax rate? (Do not round intermediate calculations and enter your answer as a percent rounded to the nearest whole number, e.g., 32.) Table 2.3 Personal Tax Rates for 2020 (Unmarried Individuals)