<div class="col-md-4">
  <b class="net_total" style="font-size:20px;"> </b>
</div>

var net_total = 0;
  $('.qty').each(function() {
    var row = $(this).parent().parent();
    var price = row.find('.price').val();
    var total = price * $(this).val() - 0;
    row.find('.total').val(total);
  });
  $('.total').each(function() {
    net_total += ($(this).val() - 0);
  });
  $.ajax({
   url:test.php,
   type:'POST',
   data: {net_total: net_total},
   success: function(){
    $('.net_total').html("Total : $ " + net_total);
   },
   });
}