An investor purchases one municipal and one corparate bond that pay rates of return of 7.5% and 10.3% respectively, if the investor is in the 25% margical tax bracket,his or her after-tax rates of return on the municipal and corporate bonds would be____and ____ respectively.

a. 7.5%;7.73%

b. 10%; 10%

c. 5.63%; 10.3%

d. 7.5%; 10.3%

e. 5.63%; 7.73%