Using the following to answer question $7$ and $8.$ Alex wants his wife and children to have $$55,000$ of annual income if he dies after paying taxes. Assume he can earn $8\%$ before tax rate of return and has a marginal tax bracket of $15\%.$

What is his after$-$tax rate of return?

$5\mathrm{.}5\%$

$8\mathrm{.}0\%$

$3\mathrm{.}2\%$

$6\mathrm{.}8\%$