There has to be a way, to store the values for each customer into a variable $money_spent.

Do you want to store the value for each customer, or an aggregate? If the former, use a hash;

my %money_spent = ();
foreach my $customer (keys %myHash) {
    $money_spent{$customer} = $myHash{$customer}->{"money"};
}
[download]

If the latter, simply sum the values:

my $money_spent = 0;
foreach my $customer (keys %myHash) {
    $money_spent += $myHash{$customer}->{"money"};
}
[download]

You can also use map to do this in a more concise fashion. Per-customer hash:

my %money_spent = map { $_ => $myHash{$_}->{"money"} } keys %myHash;
[download]

Aggregate (using the sum function from List::Util):

use List::Util qw/sum/;
# ...
my $money_spent = sum map { $myHash{$_}->{"money"} } keys %myHash;
[download]

Or do you want to do something else entirely?

EDIT: note that the above snippets assume that %myHash looks something like this:

my %myHash = (
    "Fred Flintstone" => {
        "money" => 1000,
        "wife"  => "Wilma",
    },
    "Barney Rubble" => {
        "money" => 2000,
        "wife"  => "Betty",
    },
);
[download]

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