Untested code: 
my @copy = $AP_NumClients[0];
for (my $i = 1; $i < @AP_NumClients; $i++) {
    my $id = $AP_NumClients[$i][0];
    if ($id =~ s/\.1$/.0/ && $id eq $copy[-1][0]) {
        $copy[-1][1] += $AP_NumClients[$i][1]
    }
    else {
        push @copy, $AP_NumClients[$i];
    }
}
@AP_NumClients = @copy;

[download]

In reply to Re: Combining Duplicate entries in an Array by JavaFan
in thread Combining Duplicate entries in an Array by mmartin

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