Lacy is a single taxpayer. In 2017, her taxable income is $50,000. What is her tax liability in each of the following alternative situations? Use Tax Rate Schedule for reference. (Do not round intermediate calculations. Round your answer to 2 decimal places.)

a. All of her income is salary from her employer.

b. Her $50,000 of taxable income includes $2,400 of qualified dividends.

c. Her $50,000 of taxable income includes $18,100 of qualified dividends.