. As of October 2018, the risk-free rate, represented by annual return on 20-year treasury bond was 3.3 percent, beta value for Walmart stood at 0.51, while the average market return, represented by average annualized total return for the S&P 500 index over the past 90 years, is 9.8 percent. From the balance sheet, the total shareholder equity for Walmart for the 2018 fiscal year was $77.87 billion (E), and the debt stood at $36.83 billion (D). Walmart issued bond with a maturity date of August 2037 offers a coupon of 6.5%. The U.S. federal corporate income tax rate is a charged at a flat 21 percent. Calculate WACC for Walmart this year..