title: divide the value of a column by another column
body: <p>I want to divide a value of a column by the value of another column and display the result as separate column</p>
  
  <p>ex:</p>
  
  <pre>
  project name             total-percent        no.of screen
  ------------            --------------        -------------
  pro-1                     150                     5
  pro-2                      50                     3
  </pre>
  
  <p>now i want to divide total-percent by no.of screen and display the result in another column</p>