Weighted average cost of capital American​ Exploration, Inc., a natural gas​ producer, is trying to decide whether to revise its target capital structure. Currently it targets a 50​-50 mix of debt and​ equity, but it is considering a target capital structure with 70​% debt. American Exploration currently has 6​% ​after-tax cost of debt and a 12​% cost of common stock. The company does not have any preferred stock outstanding. What is American​ Explorations current​ WACC?