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Scenario: You work for an investment banking firm and have been asked by management of Vestor Corporation (not real), a software development company, to calculate its weighted average cost of capital, to use in evaluating a new company investment. The firm is considering a new investment in a warehousing facility, which it believes will generate an internal rate of return of 11.5%. The market value of Vestor's capital structure is as follows: 

Source of Capital          Market Value

Bonds                                   $10,000,000

Preferred Stock              $2,000,000

Common Stock               $8,000,000

To finance the investment, Vestor has issued 20 year bonds with a $1,000 par value, 6% coupon rate and at a market price of $950. Preferred stock paying a $2.50 annual dividend was sold for $25 per share. Common stock of Vestor is currently selling for $50 per share and has a Beta of 1.2. The firm's tax rate is 34%. The expected market return of the S&P 500 is 13% and the 10-Year Treasury note is currently yielding 3.5%. 

Determine what discount rate (WACC) Vestor should use to evaluate the warehousing facility project.