Any new long-term debt issued by the company will likely have a 30-year maturity. How valid is an estimate of the cost of debt based on 15-year bonds?…

Any new long-term debt issued by the company will likely have a 30-year maturity. How

valid is an estimate of the cost of debt based on 15-year bonds? If the estimate is not valid,

how might it be adjusted to remove any bias?