An investor purchases one municipal bond and one corporate bond that pay rates of return of 5% and 6.4%, respectively. If the investor is in the 15% tax bracket, his after-tax rates of return on the municipal and corporate bonds would be, respectively, _____.Show your work

A.

5% and 6.4%

B.

5% and 5.44%

C.

4.25% and 6.4%

D.

5.75% and 5.44%