Calculating cost of debt.

Mudvayne inc has a debt issue outstanding with 18yrs to maturity.

that is quoted at 107 percent of face value.

the issue makes semiannually payments and has an embedded cost of 6 percent annually.

What is the companys pretax cost of debt?

if the tax rate is 35 percent, what is the after tax cost of debt?

need help with steps.

thank you