Scot and Vidia, married taxpayers, earn $242,400 in taxable income and $5,000 in interest from an investment in City of Tampa bonds. (Use the U.S. tax rate schedule for married filing jointly.) Required: a. If Scot and Vidia earn an additional $82,400 of taxable income, what is their marginal tax rate on this income? b. What is their marginal tax rate if, instead, they report an additional $82,400 in deductions? Note: For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places. a. Marginal tax rate b. Marginal tax rate % %