Chuck, a single taxpayer, earns $75,200 in taxable income and $10,200 in interest from an investment in City of Heflin bonds. (Use the U.S. taxuateschedule) 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? Note: For all requirements, do not round intermediote calculations. Round percentage onswers to 2 decimal places