ts. De La Fuente has a tax base of $30,000 and pays a tax of $2,500 on the first $25,000 and $750 on the next $5,000. In addition to the taxable income, she also has non- taxable municipal bond income of $5,000. What is Mrs. De La Fuente's effective tax rate? a. 9.28 percent. b. 15 percent. c. 20 percent. d. 10.83 percent. e. None of the above