Wat is Wenn S EVA? 3-8 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 tables presented in the chapter. Assume that their taxable income this year was $375,000. a. What is their federal tax liability? b. What is their marginal tax rate? c. What is their average tax rate? 25. Which of the following factors could explain why Michigan Energy's cash balance increased even though it had a negative cash flow last year? a. The company sold a new issue of bonds. (b) The company made a large investment in new plant and equipment. c. The company paid a large dividend. d. The company had high depreciation expenses. e. The company repurchased 20% of its common stock