Calculate the cost of debt for Dell. The following table provides the yield to maturity for each of Dell's bonds. What is the weighted average cost of debt for Dell using the book value weights and the market value weights? Does it make a difference in this case if you use book value weights or market value weights?

Ratings Last Sale Include in Bond lssuer Name Coupon Maturity Callable Moody's S&P Fitch Price Yield Watchlist Symbol DELL DELL.GF|INCORPORATED 04/15/2013 Yes A2 NR A 99.750 4.767 DELL INCORPORATED DELL INCORPORATED DELL INCORPORATED DELL.GG 5.65 04/15/2018 Yes A2 NR A 92.6716.74 DELL.GB 04/15/2028 91.9447.925 7.10 Yes A2 A- A DELLGH 81.896 8.132 04/15/2038 Yes A2 A- A Ratings Last Sale Include in Bond lssuer Name Coupon Maturity Callable Moody's S&P Fitch Price Yield Watchlist Symbol DELL DELL.GF|INCORPORATED 04/15/2013 Yes A2 NR A 99.750 4.767 DELL INCORPORATED DELL INCORPORATED DELL INCORPORATED DELL.GG 5.65 04/15/2018 Yes A2 NR A 92.6716.74 DELL.GB 04/15/2028 91.9447.925 7.10 Yes A2 A- A DELLGH 81.896 8.132 04/15/2038 Yes A2 A- A