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 $90,800?

b. What would be the average tax rate for a married couple with income of $90,800?

c. What would be the marginal tax rate for an unmarried taxpayer with income of $90,800?

d. What would be the average tax rate for an unmarried taxpayer with income of $90,800?