Use Table 3.6. (Do not round intermediate calculations. Enter the average tax rate as a percent rounded to 1 decimal place.) a. What would be the marginal tax rate for a married couple with income of $89,800? b. What would be the average tax rate for a married couple with income of $89,800? c. What would be the marginal tax rate for an unmarried taxpayer with income of $89,800? d. What would be the average tax rate for an unmarried taxpayer with income of $89,800? a. Marginal tax rate for a married couple b. Average tax rate for a married couple C. Marginal tax rate for an unmarried taxpayer d. Average tax rate for an unmarried taxpayer % % % %