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 6.0 % 30 % Preferred stock 12.0 20 Common equity 16.0 50 Plan B Debt 6.5 % 40 % Preferred stock 12.5 20 Common equity 17.0 40 Plan C Debt 7.0 % 45 % Preferred stock 20.7 20 Common equity 14.8 35 Plan D Debt 14.0 % 50 % Preferred stock 21.2 20 Common equity 16.5 30 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.).