need help.

Campbell, a single taxpayer, earns $408,000 in taxable income and $2,640 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 $16,600 of taxable income, what is her marginal tax rate on this income? b. What is her marginal rate if, instead, she had $16,600 of additional deductions? Note: For all requirements, do not round intermediate calculations. Round percentage answers to whole percent. Schedule Z-Head of Household \begin{tabular}{|c|c|c|} \hline If taxable income is over: & But not over: & \multicolumn{1}{|c|}{ The tax is: } \\ \hline$$15,700 & 10% of taxable income \\ \hline$15,700 & $59,850 & $1,570 plus 12% of the excess over $15,700 \\ \hline$59,850 & $95,350 & $6,868 plus 22% of the excess over $59,850 \\ \hline$95,350 & $182,100 & $14,678 plus 24% of the excess over $95,350 \\ \hline$182,100 & $231,250 & $35,498 plus 32% of the excess over $182,100 \\ \hline$231,250 & $578,100 & $51,226 plus 35% of the excess over $231,250 \\ \hline$578,100 & - & $172,623.5 plus 37% of the excess over $578,100 \\ \hline \end{tabular} Schedule Y-2-Married Filing Separately \begin{tabular}{|c|c|c|} \hline If taxable income is over: & But not over: & The tax is: \\ \hline$10 & $11,000 & 10% of taxable income \\ \hline$11,000 & $44,725 & $1,100 plus 12% of the excess over $11,000 \\ \hline$44,725 & $95,375 & $5,147 plus 22% of the excess over $44,725 \\ \hline$95,375 & $182,100 & $16,290 plus 24% of the excess over $95,375 \\ \hline$182,100 & $231,250 & $37,104 plus 32% of the excess over $182,100 \\ \hline$231,250 & $346,875 & $52,832 plus 35% of the excess over $231,250 \\ \hline$346,875 & - & $93,300.75 plus 37% of the excess over $346,875 \\ \hline \end{tabular} 2023 Tax Rate Schedules Individuals