8. Intermountain Resources is a multidivisional company. It has three divisions with the following betas and proportion of the firm's total assets: The risk-free rate is 7 percent, and the market risk premium is 8 percent. a. What is the firm's weighted average beta? b. What required equity rate of return should the firm use for average-risk projects in its natural gas pipeline division? c. What required equity rate of return should the firm use for average-risk projects in its oil and gas exploration division