work (Chapter 1)6 Chuck, a single taxpayer, earns $75,000 In taxable income and $10,000 in interest from an Investment in City of Heflin bonds. (Use the U.S. taxrate 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 it, instead, he had $40,000 of additional deductions? For all requirements, do not round Intermediate calculations. Round your answers to 2 decimal places) 3 0