Chuck, a single taxpayer, earns $77,600 in taxable income and $12,900 in interest from an investment in City of Heflin bonds. (Use the U.S. tax rate schedule.) Required: a. If Chuck earns an additional $40,000 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 intermediate calculations. Round percentage answers to 2 decimal places. Answer is complete but not entirely correct. a. Marginal tax rate b. Marginal tax rate 18.76 % 11.45 x % 2022 Tax Rate Schedules Individuals Schedule X-Single If taxable income is over: But not over: $ 0 $ 10,275 $ 41,775 $ 89,075 $ 170,050 $ 215,950 $539,900 $ 10,275 $ 41,775 $ 89,075 $ 170,050 $ 215,950 $539,900 The tax is: 10% of taxable income |$1,027.50 plus 12% of the excess over $10,275 | $4,807.50 plus 22% of the excess over $41,775 $15,213.50 plus 24% of the excess over $89,075 $34,647.50 plus 32% of the excess over $170,050 $49,335.50 plus 35% of the excess over $215,950 | $162,718 plus 37% of the excess over $539,900