Problem 3-26 Tax Rates (LO4) Using Table 3.Z, calculate the marginal and average tax rates for a single taxpayer with the following incomes: (Do not round intermediate calculations. Round your answers to 1 decimal place.) Answer is complete but not entirely correct. Marginal Tax Rate Income a. 20,000 b. S 50,000 c. 300,000 d 3,000,000 Average Tax Rate 15.0 % 16.7 0% 33.00 % 35.0 % 12.10 % 167 0% 27,69 % 34.2@|% C