Answer:
d. 5.14%.
Explanation:
Calculation to determine the best estimate of the after-tax cost of debt.
First step
Based on the information given we would make use of rate formula in excel.
=rate(nper,pmt,-pv,fv)
Where,
nper= coupon every six months for 20 years = 40 coupon payments
Pmt =$1000*7.25%*6/12=$36.25
Pv = $875
Fv =$1000
Let plug in the formula
=rate(40,36.25,-875,1000)=4.28% semiannually
=4.28% *2=8.56% annually
Now let calculate the after tax cost of debt using this formula
After tax cost of debt=8.56%*(1-t)
Where,
t represent tax rate of 40%
Let plug in the formula
After tax cost of debt=8.56%*(1-0.4)
After tax cost of debt=5.14%
Therefore the best estimate of the after-tax cost of debt is 5.14%