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 US, tax rate schedule.) Required: points 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? eBook Print References (For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places.) Marginal tax rate Marginal tax rate