which is correct?

Tobin's Barbeque has a bank loan at 8% interest and an after-tax cost of debt of 6%. What will the after-tax cost of debt be when. the loan is due if a new loan is taken out yielding 11%. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. 8.25% 13.30% 5.70% None of these options are true