| The pre-tax cost of the debt will be that discount rate that makes the present value of the twelve remaining coupon payments, and the maturity payoff amount 12 years hence, equal to 105 (use 8 and 100 for the coupon and the maturity payoff amounts, respectively). Thus, you have all the info you need to run through the PV calculations, using trial-and-error until you zero in on the discount rate that produces the PV of 105.
For the after-tax cost, just as Ithappenstoall mentioned, you'll also need the firm's tax rate. |