/**
  * 	_sub_item_row
  *
  * @param EE_Line_Item $line_item
  * @return mixed
  */
 private function _sub_item_row(EE_Line_Item $line_item)
 {
     // start of row
     $html = EEH_HTML::li();
     $html .= EEH_HTML::ul('', '', 'event-cart-sub-item-list sub-item-list');
     // name td
     $content = $line_item->name();
     // discount/surcharge td
     if ($line_item->is_percent()) {
         $content .= ' ' . $line_item->percent() . '%';
     } else {
         $content .= ' ' . $line_item->unit_price_no_code();
     }
     $content .= ' ' . $line_item->total_no_code();
     $html .= EEH_HTML::li($content);
     // end of row
     $html .= EEH_HTML::ulx();
     $html .= EEH_HTML::lix();
     return $html;
 }