Reacher Technology has consulted with investment bankers and determined the interest rate it would pay for different capital structures, as showm below. Data for the risk-free rate, the market risk premium, an estimate of Reacher's unlevered beta, and the tax rate are also shown below. Based on this infermation, what is the firm's optimal capital structure and what is the weighted average cest of capital at the optimal structure? Fill in formulas in the yellow cells to find the optimum eapital structure