My company with an income tax rate of 20% has three sources of its capital: 60% common stock, 5% bonds, and 35% preferred stock. The cost/return of each has been computed to be: 8% for the common stock before any taxes, 8% for the bonds before any taxes, and 8% for the preferred stock before any taxes. What is the weighted cost of capital for the company? Provide labels and step-by-step computations.