You can replace the whole if-elsif paragraph with just 
my %count_of;
if (/([ACDEFGHIKLMNPQRSTVWY])/) {
    $count_of{$1}++
}

[download]
As for the result, do not use double quotes around arithmetical operations. With the hash suggested above you can just:
print RESULT  join ' ',
    $id,
    map $count_of{$_}/$tt, qw/A C D E F G H I K L M N P Q R S T V W Y/
+;
print "\n";

[download]

In reply to Re: dividing numbers by choroba
in thread dividing numbers by Anonymous Monk

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