Susan and Stan Britton are a married couple who hle a joint income tax return, where the tax rates are based on the tax table 35: Assume that their taxable income this year was $330,000. Do not round intermediate calculation a. What is their federal tax liability Round your answer to the nearest cent b. What is their marginal tax rate? Round your answer to two decimal places c. What is their average tax rate? Round your answer to two decimal places