Weighted Average Cost of Capital Gardner, In., plans to finance its expansion by raising the needed investment capital from the following sources in the indicated proportions and respective capital cost rates: Capital Cost Proportion Rate 40% 12 % Source Bonds Preferred stock 20% 8% 11 % Common stock 30% Retained earnings 10% 8% 100% Calculate the weighted average cost of capital. Round answers to one decimal place. For example, 0.457 45.7%. Weighted Average Cost of Capital Bonds Preferred stock Common stock Retained earnings Check