title: how to add subtract divide and multiply columns on a dataframe?
body: <p>i hope you can help me.
  i need to get this result:
  for item in each row, create Max(In/Out Util)-1Mbr column with result:</p>
  
  <blockquote>
    <p>df['Max(In/Out Util)-1Mbr'] = [df['Max(In/Out Util)']/100*df['Egress
    Speed']] / [df['Egress Speed']-(df['Egress Speed']/df['Oper. Member
    Count'])]*100</p>
  </blockquote>
  
  <p>Original DataFrame</p>
  
  <pre><code>Site Name           Oper. Member Count  Egress Speed    Max(In/Out Util)
  KB201_XXX71_SR7                     2       6000000             11,1527 
  KB201_XXX71_SR7                     2           N/A                 N/A 
  KN092_XXX71_SR7                     4       4000000             9,60783
  </code></pre>
  
  <p>FinalDataFrame</p>
  
  <pre><code>Site Name           Oper. Member Count  Egress Speed    Max(In/Out Util)    Max(In/Out Util)-1Mbr
  KB201_XXX71_SR7                     2       6000000             11,1527                     22,3
  KB201_XXX71_SR7                     2           N/A                 N/A                     N/A
  KN092_XXX71_SR7                     4       4000000             9,60783                     12,8
  </code></pre>