Campbell, a single taxpayer, earns $428,000 in taxable income and $2,560 in interest from an investment in State of New York bonds. (Use the U.S.tax rate schedule).

Required:

1. If Campbell earns an additional $16,400 of taxable income, what is her marginal tax rate on this income?
2. What is her marginal rate if, instead, she had $16,400 of additional deductions?

a.Marginal tax rate ___%. ?

b.Marginal tax rate___% ?