An investor purchases one municipal and one corporate bond that pay rates of return of 8% and 15%, respectively. If the investor is in the 30% marginal tax bracket, his or her after-tax rates of return on the municipal and corporate bonds would be ________ and ______, respectively.

a. 10%; 10%

b. 5.6%; 10.5%

c. 8%; 10.5%

d. 5.6%; 15%

e. 8%; 15%