Refer to the individual rate schedules in Appendix C.

a. What are the tax liability, the marginal tax rate, and the average tax rate for a married individual filing separately with $42,500 taxable income?

b. What are the tax liability, the marginal tax rate, and the average tax rate for a single individual with $150,500 taxable income?

c. What are the tax liability, the marginal tax rate, and the average tax rate for a head of household individual with $275,000 taxable income?

d. What are the tax liability, the marginal tax rate, and the average tax rate for a married couple filing jointly with $620,000 taxable income?