Using Table. 3.6, 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.) a. A married couple earned $115,000 in 2020. How much did they pay in taxes? (Use the tax rates presented in Table 3.6 ) (Do no round intermediate calculations.) b. What was their marginal tax bracket? c. What was their average tax bracket? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Q Answer is complete but not entirely correct