Ch16 Toolt.xlsx Chapter'$M$199 Racher Tatlogy has consulted with investmentbankers and determined the interest rate it would pay for erent capital structures, as shown below. Data for the tree rate the market rak premium, an estimate Te Racher's never bete, and the text are also shown below. Based on this information, what is the mbm' mal capital structure and what is the weighted average cost of capital at the optimal structure? Percent Input Data Before-a Coat Debt 63% 6.7% 12.5% 18.05 ARRARA ARARARA formulas in the yellow cells to find the optimum capital structure Na Lavered quity AT Cost of 828 T 0 Cost of quiry e WACC WACC at optimum debt ratio Optimum debt ratio R