In 2017, Carson is claimed as a dependent on his parent's tax return. His parents' ordinary income marginal tax rate is 28 percent. Carson's parents provided most of his support. What is Carson's tax liability for the year in each of the following alternative circumstances? Use Tax Rate Schedule for reference.

a. Carson is 17 years old at year-end and earned $12,450 from his summer job and part-time job after school. This was his only source of income.