Sauer Milk Inc. wants to determine the minimum cost of capital point for the firm. Assume it is considering the following financial plans: Cost (aftertax) Weights Plan A Debt 4.0 % 10 % Preferred stock 8.0 5 Common equity 12.0 85 Plan B Debt 4.2 % 20 % Preferred stock 8.2 5 Common equity 13.0 75 Plan C Debt 5.0 % 30 % Preferred stock 10.7 5 Common equity 9.6 65 Plan D Debt 13.0 % 40 % Preferred stock 11.6 5 Common equity 11.6 55 a-1. Compute the weighted average cost for four plans. (Do not round intermediate calculations. Input your answers as a percent rounded to 2 decimal places.)