In 2020, Carson is claimed as a dependent on his parents' tax return. His parents report taxable income of $200,000 (married filing jointly). Carson's parents provided most of his support. What is Carson's tax liability for the year in each of the following alternative circumstances?

b. Carson is 23 years old at year-end. He is a full-time student and earned $15,300 from his summer internship and part-time job. He also received $6,300 of qualified dividend income