If you know that the cost of ordinary ownership is 15%, the cost of preferred stock is 100%, the interest rate on the company's debt is 6%, and the income tax rate to which the company is subject is 40% The volume of financing with ordinary equity is 2,200,000 dinars, and the volume of financing with excellent equity is 600,000 dinars. The volume of financing by debt is 1,200,0000 dinars.

Find the weighted average cost of capital.