Need to calculate the cost of debt for Tesla. Go to finra-markets.morningstar.com/BondCenter, enter Tesla as the company, and find the yield to maturity for each of Tesla's bonds. What is the weighted average cost of debt for Tesla using the book value weights and the market value weights? Does it make a difference in this case if you use the book value weights or market value weights?

I have the yield information, but what I do not understand is what additional information do I need to calculate the weighted average cost of debt? Where would that information come from? Please help.