Here is a potentially scalable approach using an in-memory SQLITE database: 
use strict;
use warnings;
use Data::Dumper qw(Dumper);
use DBI;

my $aref = [
   { 'cname' => 'Smart Parking',     'balance' => 10.12, },
   { 'cname' => 'Smart Parking',     'balance' => 10.22, },
   { 'cname' => 'Smart Parking',     'balance' => 10.32, },
   { 'cname' => 'Highview Parking',  'balance' => 20.12, },
   { 'cname' => 'Highview Parking',  'balance' => 20.22, },
   { 'cname' => 'Highview Parking',  'balance' => 20.32, },
   { 'cname' => 'Highview Parking',  'balance' => 20.42, },
   { 'cname' => 'ParkingEye',        'balance' => 30.12, },
   { 'cname' => 'ParkingEye',        'balance' => 30.22, },
   ];
 
my $dbh = DBI->connect("dbi:SQLite:dbname=:memory:");
$dbh->do("CREATE TABLE parking (
   cname    TEXT,
   balance  REAL
)");
 
for my $row (@$aref){
  $dbh->do("INSERT INTO parking (cname,balance)  VALUES ('$row->{cname
+}',$row->{balance})");
}
 
my $sth = $dbh->prepare("SELECT cname, sum(balance) as balance, count(
+*) as count 
               FROM parking GROUP BY cname ORDER BY cname");
$sth->execute;
my $result ;
while (my $r = $sth->fetchrow_hashref()) {
    push @$result, { balance => $r->{balance}, cname => $r->{cname}, t
+otal => $r->{count} }
}

print Dumper $result;

[download]
It produces: 
$VAR1 = [
          {
            'balance' => '81.08',
            'total' => 4,
            'cname' => 'Highview Parking'
          },
          {
            'balance' => '60.34',
            'total' => 2,
            'cname' => 'ParkingEye'
          },
          {
            'balance' => '30.66',
            'total' => 3,
            'cname' => 'Smart Parking'
          }
        ];

[download]
Plenty of room for making it more robust and improving performance .. left as an exercise.

                "From there to here, from here to there, funny things are everywhere." -- Dr. Seuss

In reply to Re: How to combine the values from hash using 'cname', along with total and balance. by NetWallah
in thread How to combine the values from hash using 'cname', along with total and balance. by Sami_R

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