i have used the code given by corion for the problem which i faced. I have tested with some values and the results of them are:

Input     Output Through Code   Expected Output.

4ABC      8.432                 11.93544  
2A2B2C    8.644                 23.87
3C        4.5                   4.5
ABC       4.322                 2.98386
[download]

Only 1 value is coming correct. Other values are showing some discrepancies. I am attaching the code below:

$a="ABC";
$b=length($a);
print "$b\n";
for($i=0;$i<$b;$i++){
$a=~s/(\d+)(.)/$2 x $1/ge;
}
print "$a\n";
my %value = (
    A => 2.74,
    B => 2.64,
    C => 2.5,
);

my %factor = (
    A => 50/100,
    B => 55/100,
    C => 60/100,
);

my @letters = split //, $a;
my $result = 0;
my $temp=0;
for my $letter (@letters) {
   $result=$result + $value{ $letter }* $factor{ $letter };
#print "$result\n";
};

print $result;
[download]

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