You plan to invest in Project A. The amount of initial investment is $1,000,000, and you can raise funds from both bondholders and shareholders. Specifically, you can borrow $500,000 by issuing bonds at 5%, and you can raise $500,000 by issuing shares. The expected return on the common stocks is 15%. Also, the opportunity cost of capital is 15%. What is the appropriate discount rate to use for this project?