Write a ratio analysis and give comments on the Walmart company financial performance, including profitability analysis likes profit margin, ROA and ROE.  

Walmart Financial Summary Total Asset Total Revenue Total Expenses Total stockholder's equity Net Income Profit Margin O ROA 1 ROE 2 B $ 243,457,000 $ 630,794,000 $ 159,466,000 76,693,000 14,041,000 $ $ Net Income/Total Revenue Net Income/Total Assets Net income/Total Stockholder's Equity 2.23% 5.77% 18.31%