6. Check My Work (5 remaining) 8. Click here to read the eBook: Income Taxes PERSONAL TAXES 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 that their taxable income this year was $307,000. Round your answers to two decimal places. a. What is their federal tax liability? S b. What is their marginal tax rate? c. What is their average tax rate? % Check My Work (5 remaining) 0-Icon Ky A Problem 3.08 Question 8 of 8 Save Submit Assignment for Grading C do 7:31 PM