i dont't know where im going wrong. can sombody please tell me what this means?

Missing $ on loop variable at measurements2.pl line 69.
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here is my code...

#!/usr/local/bin/perl

use strict;
use warnings;

my $path='CustData.txt';
my @range = ("10-20", "20-30", "30-40", "41-50", "51-60", "61-70", "71
+-80","81-90", "91-99");
my @count;
my @percent;
my %HoH;

open(DATA, "<$path") || die "Couldn't open $path for reading: $!\n";

my $output;                                         
open my $fd, '>', \$output or die "open: $!";

while (<DATA>)
{
    chomp;
    my ($id, $title, $surname, $forename, $sex, $dob, $vision) = split
+(/,/);
    $HoH{$id} = {'title' => $title, 'surname' => $surname, 'forename' 
+=> $forename, 'sex' => $sex, 'dob' => $dob, 'vision' => $vision,};
}
close(DATA);

my $range1=1;
my $range2=10;
my $range3=1;
my $range4=10;
my $person_count=0;

sub personCount
{
    my ($x,$y) = @_;
    my ($vision_total,$person_count)=0;
    foreach my $id (sort keys %HoH)
    {
        if( ($HoH{$id}->{'vision'}>=$x) & ($HoH{$id}->{'vision'}<=$y) 
+)
        {
        ++$person_count;
        $vision_total=$vision_total+$HoH{$id}->{'vision'};
        }
    }
    return int($person_count);
}

sub percent
{
    my ($x,$y) = @_;
    my $percent = 0;
    my ($total_person_count,$vision_total,$person_count)=0;
    foreach my $id (sort keys %HoH)
    {
        ++$total_person_count;
    }

    foreach my $id (sort keys %HoH)
    {
        if( ($HoH{$id}->{'vision'}>=$x) & ($HoH{$id}->{'vision'}<=$y) 
+)
        {
        ++$person_count;
        $vision_total=$vision_total+$HoH{$id}->{'vision'};
        }
    }
    return $percent = ($person_count/$total_person_count)*100;
}

print $fd ("Range\t");
   foreach (@range)
    {
        printf $fd ("%7s", $_);
    }
    print $fd ("\n");
    
for my ($counter=0;$counter<9;$counter++)
{
    $range3=$range3+10;
    $range4=$range4+10;
    my $personCount = personCount($range3,$range4);
    push (@count, $personCount);
    
}
print $fd ("Count\t");
   foreach (@count)
    {
        printf $fd ("%7s", $_);
    }
    print $fd ("\n");

for my ($counter=0;$counter<9;$counter++)
{
    $range1=$range1+10;
    $range2=$range2+10;
    my $percent = sprintf("%.0f", percent($range1,$range2));
    push (@percent, $percent);
}
print $fd ("Percent\t");
   foreach (@percent)
    {
        printf $fd ("%7s", $_);
    }
    print $fd ("\n");

print $fd ("\n");
close $fd;
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