Hello Monks Seeking for wisdom I have this hash of hash where I have been asked to find sum of value when cost key is found. In this case 430, I was thinking some how mapping to find all the cost keys and iterating over to sum them. Sample

use Data::Dumper;

my $VAR1 = {
          '153-1' => {
                        '19-4' => {
                                       'cost' => '6300.00',
                                       'cost2' => '630.00'
                        },
            '135-1' => {
                        '68-4' => {
                                       'cost' => '300.00',
                                       'cost2' => '130.00'
                        }
            },
             '1069-9' => {},
             '35-1' => {
                        '28-4' => {
                                       'cost' => '30.00',
                                       'cost2' => '10.00'
                        }
             },

          },
};


#%result =  map { "$_->{0} => $_->{2}" } $VAR1;
#print Dumper \%result;
[download]

I have tried using map but I am not able for find correct solution any guidance to reach my destination. Thank you in advance wise one!