find marginal tax rates? ( its not 32% or 35% because i already tried those)

Campbell, a single taxpayer, earns $402,500 in taxable income and $2,200 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 $15,500 of taxable income, what is her marginal tax rate on this income? b. What is her marginal rate if, instead, she had $15,500 of additional deductions? Note: For all requirements, do not round intermediate calculations. Round percentage answers to whole percent