Campbell, a single taxpayer, earns $400,000 in taxable income and $2,000 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 $15,000 of taxable income, what is her marginal tax rate on this income? b. What is her marginal rate if Instead, she had $15,000 of additional deductions? (For all requirements, do not round intermediate calculations.) Marginal tax rate Individuals Schedule X-Single If taxable income is over: But not over: er. Rut not over: The tax is: $ 0 $ 9,700 10% of taxable income $ 9,700 $ 39,475 $970 plus 12% of the excess over $9,700 $ 39,475 $ 84,200 $4,543 plus 22% of the excess over $39,475 $ 84,200 $160,725 $14,382.50 plus 24% of the excess over $84,200 $160,725 $204,100 $32,748.50 plus 32% of the excess over $160,725 $204,100 $510,300 $46,628.50 plus 35% of the excess over $204,100 $510,300 $153,798.50 plus 37% of the excess over $510,300 Schedule Y-1-Married Filing Jointly or Qualifying Widow(er) If taxable income is over: But not over: The tax is: $ 0 $ 19,400 10% of taxable income $ 19,400 $ 78,950 $1,940 plus 12% of the excess over $19,400 $ 78,950 $168,400 $9,086 plus 22% of the excess over $78,950 $168.400 $321,450 $28,765 plus 24% of the excess over $168.400 $321,450 $408,200 $65,497 plus 32% of the excess over $321,450 $408.200 $612,350 $93,257 plus 35% of the excess over $408.200 $612,350 $164,709.50 plus 37% of the excess over $612,350 Schedule Z-Head of Household If taxable income is over: But not over: The tax is: $ 0