12) You face an income tax situation where your first $25,000 of income is tax exempt; the next $25,000 is subject to 10% income taxes; the third $25,000 is subject to 20% income taxes; and any amount after that is subject to 30% income tax. You are currently earning $75,000. Your average and marginal tax rates are and respectively. a. 10% and 10% b. 15% and 20% c. 10% and 20% d. 15% and 30% e. none of the above