Last year, Rotterdam, Inc. had sales revenue of $980,000. Costs other than depreciation and interest expense were 20 percent of sales. Depreciation expense was $50,000, interest expense was $95,000, and dividends paid were $23,000. The company also received dividends of $8,000 from a company in which it had 30% ownership stake. Which of the following statements is most CORRECT? (Use the corporate tax table and tax rules contained in the class formula sheet and lecture guide.) a. The firm's taxable income was $637,400. b. The firm's after-tax income was $405,564. c. The firm's marginal tax rate was 39 percent. d. The firm's tax for the year was $113,900. e. None of the above