YourSpace has an outstanding bond that has $10$ years to maturity. It has a coupon rate of $10\%$ paid semiannually and the face value is $$1,000.$ If YourSpace wanted to issue debt, it would have flotation costs of $3\%.$ YourSpace has an effective tax rate of $40\%.$ If the current market price for the bond is $$900,$ what is YourSpace$$s after$-$tax cost of debt?

$12\mathrm{.}2\%$

$3\mathrm{.}7\%$

$7\mathrm{.}3\%$

$6\mathrm{.}1\%$