title: What is the difference among base_grand_total , grand_total, sub_total in Magento CE 1.7?
body: <p>Can anybody provide a clear definitions for the followings in magento?</p>
  
  <pre><code>grand_total
  sub_grand_total
  sub_total
  </code></pre>
  
  <p>Any help will be appreciated.</p>