Stephanie is considering purchasing a fixed$-$income investment. She has narrowed her list of bond choice to two AAA$-$rated investments. The first is a corporate bond that matures in seven years. The bond yields $6\mathrm{.}35$ percent. The second bond also matures in seven years; however, this bond is a municipal bond issued by the state in which Stephanie resides. The bond has a current coupon rate at $4\mathrm{.}79$ percent. Stephanie is in the $25$ percent marginal federal tax bracket and the $3\mathrm{.}50$ percent marginal state tax bracket. Which bond should she invest in to maximize her after$-$tax rate of return?