Determine the tax liability, marginal tax rate, and average tax rate in each of the following ca Use the appropriate Tax Tables and Tax Rate Schedules. a. Married taxpayers, who file a joint return, have taxable income of $36,568. b. Single taxpayer, has taxable income of $67,228. Note: For all requirements, use the tax tables to compute tax liability. Round "Average tax r Tax liability a. Marginal tax rate 12 % Average tax rate % b. 22 % %