if ( $cash > $goal ) {
    my $dif = $cash - $goal;
    notify_user( qq|Yay! you won, you beat your goal by \$$dif\n| );
}
if ($cash < $goal) {
    my $dif = $goal - $cash;
    notify_user( qq|Boo! you lost, you missed your goal by \$$dif\n| );
}