Use Table 3.6. Note: Do not round intermediate calculations. Round your answers to 1 decimal place. a. What would be the marginal tax rate for a married couple with income of $91,000 ? b. What would be the average tax rate for a married couple with income of $91,000 ? c. What would be the marginal tax rate for an unmarried taxpayer with income of $91,000 ? d. What would be the average tax rate for an unmarried taxpayer with income of $91,000 ? TABLE 3.6 Personal tax rates, 2022