Refer to the individual rate schedules in Appendix C.

1. 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?
2. What are the tax liability, the marginal tax rate, and the average tax rate for a single individual with $150,500 taxable income?
3. 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?
4. 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?