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As in the Perl example, just use integer arithmetic and you'll be fine. Separate dollars from cents at the end of your script.

Yes, lots of ways to do this. One example in Perl (not using error checking to keep it simple):

open(IN, "<my_file.txt");
while($in = <IN>)
{
$sum += $in;
}
$sum =~ /(\d+?)(\d\d)$/;...