Susan is single with a gross income of $110,000 and a taxable income of $88,000. In calculating…

Susan is single with a gross income of $110,000 and a
taxable income of $88,000. In calculating gross income, she properly excluded
$10,000 of tax-exempt interest income. Using the tax rate schedules in the
chapter, calculate Susan’s

a. Total tax c. Average tax rate

b. Marginal tax rate d. Effective tax rate