Chuck, a single taxpayer, earns $$78,200$ in taxable income and $$13,600$ in interest from an investment in City of Heflin bonds, $($Use the U$.$S$.$ taxrate$\_$schedule.$)$

Required:

o$.$ If Chuck earns an additional $$40,000$ of taxable income, what is his marginal tax rate on this income? b$.$ What is his marginal rate if$,$ instead, he had $$40,000$ of additional deductions? Note: For all requirements, do not round intermediate calculations. Round percentage answers to $2$ decimal places