Jorge and Anita, married taxpayers, earn $143,000 in taxable income and $51,000 in interest from an investment in City of Heflin bonds. (Use the U.S. tax rate schedule for married filing jointly). Required: a. If Jorge and Anita earn an additional $105,500 of taxable income, what is their marginal tax rate on this income? b. What is their marginal rate if, instead, they report an additional $105,500 in deductions? (For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places.) a. Marginal tax rate b. Marginal tax rate