. An investor purchases one municipal and one corporate bond that pay rates of return of 8% and 10%, respectively. If the investor is in the 20% marginal tax bracket, his or her after-tax rates of return on the municipal and corporate bonds would be ________ and ______, respectively. A. 8%; 10% B. 8%; 8% C. 6.4%; 8% D. 6.4%; 10% E. 10%; 10%