Answer:
8.75%
Step-by-step explanation:
Find the YTM which is the pretax cost of debt.
Using a financial calculator, input the following and adjust the coupon payment, time and interest rate to semi-annual basis.
Maturity of the bond; N= 14*2 = 28
Face value : FV = 1000
Price of the bond ; PV = -745.14
Semiannual Coupon payment; PMT = semiannual coupon rate* Face value
Semiannual Coupon payment; PMT = (8.6%/2)*1000 = 43
then compute the semiannual rate; CPT I/Y = 6.25%
Annual rate; YTM ; pretax cost of debt = 6.25*2 = 12.5%
Next, find aftertax cost of debt;
Aftertax cost of debt = pretax cost of debt (1-tax)
= 0.125 (1 -0.30)
= 0.0875 or 8.75% as a percentage
Therefore; aftertax cost of debt = 8.75%