e 2016s tax year 1-18 Tr Rat e Schedules and Rate Concepts. An examination of the tax rate sched- es for single taxpayers for 2018 (see the inside cover of the text) indicates that the tax is a "given dollar amount" plus a percentage of taxable income exceeding a particular level. a. Explain how the "given dollar amounts" are determined . what is his b. Assuming the taxpayer has a taxable income of $50.000 and is single ctax liability for 20182D c. Same facts as (b). What is the taxpayer's marginal tax rate? d. Same facts as (b). What is the taxpayer's average tax rate? e. Assuming the taxpayer has tax-exempt interest income from municipal bonds of $30,000, what is the taxpayer's effective tax rate