Please explain the WACC calculations provided. I am not sure how to calculate those percentages. TIA!!!

Dinklage Corp. has 8 million shares of common stock outstanding. The current share price is $87, and the book value per share is $6. The most recent annual dividend, paid this morning, was $5.90 and the dividend growth rate is 7 percent. The company also has two bond issues outstanding. The first bond issue has a face value of $7 : million, a coupon rate of 10%, a yield to maturity of 10.34%, and sells for 97 percent of par. The second issue has a face value of $50 million, a coupon rate of 11%, a yield to maturity of 9.99%, and sells for 105 percent of par. The first issue matures in 25 years, the second in 7 years. The tax rate is 35 percent. Calculate the company's WACC. We need to first calculate cost of all components of capital Cost of equity=Dividend per share* (1+ growth rate )/ share price + growth rate =5.90(1+.07)/87+7%CostofFirstbond=Yieldtomaturity*(1taxrate)=10.34%(135%)Costofseconddebt=Yieldtomaturity*(1-taxrate)=9.72%6.99%(135%)6.49% Cost of second debt = Yield to maturity* (1 tax rate ) =9.99%(135%) 6.49% Now, we need to calculate capital invested for all components of capital Equity = no. of shares outstanding * book value per share =80000006 $48,000,000 First debt=Face value* sell price =7500000097%$72,750,000 Second debt=Face value* sell price =50000000105%$52,500,000 Now, lets put all values in tabular form \begin{tabular}{|l|l|r|r|r|} \hline Component of capital & \multicolumn{1}{|l|}{ Value } & \multicolumn{1}{l|}{ weight } & \multicolumn{1}{l|}{ Cost } & \multicolumn{1}{l|}{ WACC } \\ \hline Equity & $48,000,000 & 0.28 & 14.26% & 3.95% \\ \hline First debt & $72,750,000 & 0.42 & 6.72% & 2.82% \\ \hline Second debt & $52,500,000 & 0.30 & 6.49% & 1.97% \\ \hline & $173,250,000 & & & 8.74% \\ \hline \end{tabular} Weight of each component is calculated by dividing each capital component by total capital invested