2021 tax year

Chuck, a single taxpayer, earns $77,350 in taxable income and $12,400 in interest from an investment in City of Heflin bonds. (Use the U.S. tax rate schedule.) Required: a. If Chuck earns an additional $40,000 of taxable income, what is his marginal tax rate on this income? b. What is his marginal rate If, instead, he had $40,000 of additional deductions? (For all requirements, do not round Intermediate calculations. Round percentage answers to 2 decimal places.) Answer is complete but not entirely correct. a Marginal tax rate 18.90 % b. Marginal tax rate 11,47 %