Lacy is a single taxpayer. In 2019, her taxable income is $42,100. What is her tax liability in each of the following alternative situations? Use Tax Rate Schedule, Dividends and Capital Gains Tax Rates, Estates and Trusts for reference. Can you please show me step by step?

a. Tax Liability

b. Her $42,100 of taxable income includes $3,600 of qualified dividends.

c. Her $42,100 of taxable income includes $6,300 of qualified dividends.