MOre untested:

use strict;

my %info;
for (1..50){
  process_file($_);
} 
print "NAME\t";
print "$_\t" for (1..50);
print "\n";
for my $k (sort keys %info){
  print "$k\t";
  print "$info{$k}->[$_]\t" for (1..50);
  print "\n";
}

sub process_file{
  my $filenbr = shift;
  open my $f, "<" , "RESULT_FILE$filenbr" or die "Cannot read file $_\
+n$!";
  while(<$f>){
    my ($name,$val) = split;
    $info{$name}->[$filenbr] = $val;
  }
  close $f;
}
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