title: Group by two columns and display grand total in every row
body: <p>Below are the list data.</p>
  
  <pre><code>Code   ItemCount   Type      Amount 
  ----------------------------------------
  B001    1          Dell         10.00
  B001    1          Dell         10.00
  B001    1          Apple        10.00
  B001    2          Apple        20.00
  B001    2          Apple        20.00
  B114    1          Apple        30.50
  B114    1          Apple        10.00
  </code></pre>
  
  <p>I need a result to group by code and by type and total the <code>ItemCount</code> and get the grand total of the <code>Amount</code> in every row.</p>
  
  <p>Is this possible?</p>
  
  <pre><code>Code   ItemCount    Type      Amount 
  ----------------------------------------
  B001    2          Dell          20.00
  B001    5          Apple         50.00
  B114    2          Apple         40.50 
  </code></pre>