SUPERVALU, one of the largest grocery retailers in the United States, is headquartered in Minneapolis. The following financial information (in millions) was taken from the company’s 2010 annual report. Net sales $44,597; net income $393; beginning stockholders’ equity $2,581; and ending stockholders’ equity $2,887. There were no dividends paid on preferred stock. Compute the return on common stockholders’ equity ratio. Provide a brief interpretation of your findings.