Chuck, a single taxpayer, earns $80,000 in taxable income and $10,000 in interest from an investment in City of Heflin bonds. (Use the U.S. tax rate schedule.) Required: a. If Chuck earns an additional $40,580 of taxable income, what is his marginal tax rate on this income? b. What is his marginal rate if, instead, he had $40,580 of additional deductions? (For all requirements, do not round intermediate calculations. Round percentage answers to 2 decimal places.) a % Marginal tax rate Marginal tax rate b. % 2020 Tax Rate Schedules Individuals Schedule X-Single If taxable income is over:But not over: The tax is: $ 0 $ 9,875 10% of taxable income $ 9,875 $ 40,125 $987.50 plus 12% of the excess over $9.875 $ 40,125 $ 85,525 S4.617.50 plus 22% of the excess over $40.125 $ 85,525 $163,300 $14,605.50 plus 24% of the excess over $85,525 $163,300 $207,350 $33,271.50 plus 32% of the excess over $163,300 $207,350 $518,400 $47.367.50 plus 35% of the excess over $207,350 $518,400 $156,235 plus 37% of the excess over $518.400