printf " %s At ($row, $col) the row is %s and the column is %s for EUR & NAM \n",
    $feedback_value, $my_row, $my_column;

##</code><code>##

printf " %s At (%s, %s) the row is %s and the column is %s for EUR & NAM \n",
    $feedback_value, $row, $col, $my_row, $my_column;

##</code><code>##

my $power = '95%';

(my $escaped_power = $power) =~ s/%/%%/g;
my $fmt = "sample: %-4s  result: %5.2f  power: $escaped_power\n";

for (0..$#data) {
    printf($fmt, $_, $data[$_]);
}