Autofilter

Hi,

I need an help to write VBA code for the below criteria

if column P is internal then corresponding column K value shold be zero

eg:

Column P    Column K

Revenue       $80

Revenue       $100

Internal        $90

Internal        $10

Revenue      $30

Internal        $110

The output shld be

Column P      Column K

Revenue       $80

Revenue       $100

Internal        $0

Internal        $0

Revenue      $30

Internal        $0

PLease help me