Problem Walk-Through Susan and Stan Britton are a married couple who file a joint income tax return, where the tax rates are based on the tax table 3.5. Assume their taxable income this year was $198,000. Do not round intermediate calculation. Othat O O Oa. What is their federal tax liability? Round your answer to the nearest dollar O $ Ob. What is their marginal tax rate? Round your answer to the nearest whole number. O eBook O Oc. What is their average tax rate? Round your answer to two decimal places. O % Problem Walk-Through Susan and Stan Britton are a married couple who file a joint income tax return, where the tax rates are based on the tax table 3.5. Assume their taxable income this year was $198,000. Do not round intermediate calculation. Othat O O Oa. What is their federal tax liability? Round your answer to the nearest dollar O $ Ob. What is their marginal tax rate? Round your answer to the nearest whole number. O eBook O Oc. What is their average tax rate? Round your answer to two decimal places. O %