$52$ Multiple Choice $1\mathrm{.}33$ points

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 $22\%$ marginal tax bracket, his or her after$-$tax rates of return on the municipal and corporate bonds would be $q,$ and $q,$ respectively.

$8\%$; $10\%$

$10\%$; $10\%$

$6\mathrm{.}4\%$; $8\%$

$8\%$; $7\mathrm{.}8\%$

$6\mathrm{.}4\%$; $10\%$