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  my $sql2 = qq/
     INSERT INTO transaction_details (quantity, gross_sales) 
      VALUES ($quantity,  convert (money, $gross_sales))
     /;

  my $sql2 = qq/
     INSERT INTO transaction_details (quantity, gross_sales) 
...
     my $gross_sales = $cgi->param("gross_sales_$1");
     my $rv = $sth->execute( $quantity, $gross_sales );
   }