Amical Co. is a company financed by equity and bonds. Its financing structure is presented as follows: 40% common shares, 30% preferred shares and 30% bonds. If the (effective) costs of financing by ordinary shares and preferred shares are 7% and 15%, respectively, and the (effective) cost after tax incidence of financing by bonds is 6%: The weighted average cost of capital (WACC) of the company Amical Co. is