Answer:
10.68%
Step-by-step explanation:
Face value = 1,000
Coupon rate = 10%
Years to maturity = 15
Nper = 15*2 = 30
PMT = 1000*10%/2 = 50
Price(Present value) = Bond sale price - Issue cost
Price(Present value) = 970 - 20
Price(Present value) = 950
Yield to maturity = Rate(Nper, pmt, -pv, fv) * 2
Yield to maturity = Rate(30, 50, -950, 1000) * 2
Yield to maturity = 0.0534 * 2
Yield to maturity = 0.1068
Yield to maturity = 10.68%
Thus, the before-tax cost of debt is 10.68%