Chuck, a single taxpayer, eans $84,500 in taxable income and $23,000 in interest from an investment in City of Heflin bonds. (Use the US. tax rate schedule) (Do not round intermediate calculations. Round your answers to 2 decimal places) o. If Chuck earns an additional $56,000 of taxable income, what is his marginal tax rate on this income? 75 oints Skipped eDook Print b. What is his marginal rate if, instead, he had $56,000 of additional deductions