Campbell, a single taxpayer, earns $408,000 in taxable income and $2,160 in interest from an investment in State of New York bonds. (Use the U.S. tax rate schedule). Required: a. If Campbell earns an additional $15,400 of taxable income, what is her marginal tax rate on this income? b. What is her marginal rate if, instead, she had $15,400 of additional deductions? (For all requirements, do not round intermediate calculations.) a. 351% Marginal tax rate Marginal tax rate b. % Individuals Schedule X-Single If taxable income is over: But not over: $ 0 $ 9,875 $ 9,875 $ 40,125 $ 40,125 $ 85,525 $ 85,525 $163,300 $163,300 $207,350 $207,350 $518,400 $518,400 The tax is: 10% of taxable income $987.50 plus 12% of the excess over $9,875 $4,617.50 plus 22% of the excess over $40,125 $14,605.50 plus 24% of the excess over $85,525 $33,271.50 plus 32% of the excess over $163,300 $47,367.50 plus 35% of the excess over $207,350 $156,235 plus 37% of the excess over $518,400