/**
  * 	_sub_item_row
  *
  * @param EE_Line_Item $line_item
  * @param array        $options
  * @return mixed
  */
 private function _sub_item_row(EE_Line_Item $line_item, $options = array())
 {
     // start of row
     $html = EEH_HTML::tr('', 'item sub-item-row');
     // name td
     $html .= EEH_HTML::td($line_item->name(), '', 'item_l sub-item');
     // desc td
     $html .= $options['show_desc'] ? EEH_HTML::td($line_item->desc(), '', 'item_l') : '';
     $html .= EEH_HTML::td() . EEH_HTML::tdx();
     // discount/surcharge td
     if ($line_item->is_percent()) {
         $html .= EEH_HTML::td($line_item->percent() . '%', '', 'item_c');
     } else {
         $html .= EEH_HTML::td($line_item->unit_price_no_code(), '', 'item_c');
     }
     // total td
     $html .= EEH_HTML::td($line_item->total_no_code(), '', 'item_r');
     // end of row
     $html .= EEH_HTML::trx();
     return $html;
 }