Estimate UnitedHealth care group approximate WACC; use the most recent years debt ratio to find the weights of debt and equity. If your company issues preferred stock, for simplicitys sake, ignore it. The cost of debt will be the approximate YTM calculated in Week 5. Use CAPM to calculate your companys required rate of return on the stock. The beta was determined in Week 6; use the current 10-year Treasury bonds YTM as the risk-free rate.