Problem 1-35 (LO 1-3) (Algo) U.S. tax rate schedule.) Chuck, a single taxpayer, earns $76,300 in taxable income and $11,500 in Interest from an investment in City of Hellin bonds. (Use the 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 percentage answers to 2 decimal places.) % a: Marginal tax rate b. Marginal tax rato %