Grass & Weeds Gardening Co. has a target debt/equity ratio of 2.75. Its existing bonds have a yield to maturity of 8%. Its outstanding stock has a beta of 0.75. The risk-free rate is 3% and the market risk premium is 7.5%. The tax rate is 40%. If the firm will finance its next project with 20% new equity and 80% new debt, what is the appropriate discount rate to use when analyzing the projects NPV? Select one: a. 5.82% b. 7.23% c. 7.5% d. 7.86%