The syntax is like so

my $local_foo = ${"foo_$i"}
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But symbolically referenced variables are generally a bad idea. A better option would be to use either a hash or an array (as would be fitting in your case) e.g

my @fee;
for (0 .. $MAX_ROWS){
   push @fee, $foo[$_];
}
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or better yet

my @fee = @foo[0 .. $MAX_ROWS];
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The last example is an array slice documented in the perldata manpage.
HTH

_________
broquaint