Answer:
= 4.98%
Explanation:
WACC = wE*rE + wD*rd(1-tax)
wE = weight of equity
rE= cost of equity
wD = weight of debt
rd = pretax cost of debt ; a.k.a Yield to maturity(YTM)
WACC uses the after tax cost of debt in its calculation. This is because interest rate paid on debt is tax deductible unlike dividends.
In the above formula, " rd(1-tax) " is the calculation for after tax cost of debt. In this case, you have noncallable bond whose Yield to maturity (YTM) will be the Pretax cost of debt.
Using a financial calculator, you can find the YTM with the following inputs;
N; time to maturity = 20
FV; Face value = 1,000
PV; bond price = -875
PMT; coupon payment = 7%*1000 = 70
then CPT I/Y = 8.302%
Using this component "rd(1-tax)" of WACC,
After tax cost of debt = 8.302%(1-0.4)
= 4.98%