I would not use the cut-and-paste method that you've used -- make an array of the response that you want to count, and count those up. I would also count up all of the responses. What's left over is the 'other'.

Something like this (not tested code):

  my $BaseQuery " select count(*) from owner";
  my $WhereClause = " where rent_car = '?'";

  #  Get the total number of rows in the table.

  my $sth = $dbh->prepare ( $BaseQuery );
  my $Total = $sth->fetchrow_array();

  #  Initialize a total in order to be able to calculate
  #  "Other" responses"

  my $SoFar = 0;

  #  Prepare the longer query.

  $sth = $dbh->prepare ( $BaseQuery . $WhereClause );

  #  Loop through valid responses.

  my %Responses = ( Y => "Yes", N => "No" );
  foreach ( keys %Responses )
  {
    $sth->execute ( $_ );
    my $ThisChoice = $sth->fetchrow_array();

    $SoFar += $ThisChoice;
    my $Result = sprintf ( "%3.1f%%", $ThisChoice / $Total );

    print qq ( <tr><td>$Responses{ $_ }</td><td>$Result</td></tr> );
  }

  #  Figure out how many "Other" responses there were.

  my $Result = sprintf ( "%3.1f%%", ( $Total - $SoFar ) / $Total );

  print qq ( <tr><td>Other</td><td>$Result</td></tr> );
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--t. alex

"There was supposed to be an earth-shattering kaboom!" --Marvin the Martian