Okay, here are the steps to estimate PRC's after-tax cost of debt:
1) The market price of the existing bonds is $1,229.24. So the yield to maturity (YTM) is 10% / (1,229.24 - 1,000) = 7.86% (rounded to 2 decimal places)
2) The coupon rate is 10%. So the pre-tax cost of debt is 10%.
3) The tax rate is 45%. So the effective tax rate is 1 - (1 - 0.45) = 0.55
4) The after-tax cost of debt = Pre-tax cost of debt * (1 - Effective tax rate)
= 10% * (1 - 0.55)
= 4.5%
5) Rounded to 2 decimal places, the after-tax cost of debt is 4.50%
So the closest choice is C) 2.09%
The after-tax cost of debt for PRC would be approximately 2.09% if it issues new debt.
Let me know if you have any other questions!