Peter's Audio has a yield to maturity on its debt of 7.8 percent, a cost of equity of 12.4 percent, and a cost of preferred stock of 8 percent. The firm has 105,000 shares of common stock outstanding at a market price of $22 a share. There are 25,000 shares of preferred stock outstanding at a market price of $45 a share. The bond issue has a total face value of $1.5 million and sells at 98 percent of face value. If the tax rate is 34 percent, what is the weighted average cost of capital?

Please provide full calculations.