new_contents: def percent_change(old,new):
      return int(100*(float(new)-old)/old)
  
  def print_change(old1, new1, old2, new2):
      p1 = percent_change(old1,new1)
      p2 = percent_change(old2,new2)
      print p1, "vs", p2
  
  print "#icebucketchallenge vs #alsicebucketchallenge, percentage change"
  printchange(200,500,100,300)
  printchange(500,2000,300,1500)
  printchange(2000,12000,1500,13000)
  printchange(12000,24000,13000,25000)
  printchange(24000,65000,25000,105000)
  printchange(65000,70000,105000,85000)
  
subject: add syntax error example