The Board Chair is concerned about factors that affect the corporate cost of capital for any business: the level of interest rates, tax rates, capital structure policy, and capital investment policy. Does the tax rate, cost of debt, or cost of equity have the most influence on the CCC of Southeastern Homecare? Why? (Hint: in one graph, show the CCC at +/? 25% and 50% values of the tax rates, cost of debt, and cost of equity.)