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  1. or download this
    if ($possible) {
  $average = sprintf("%2.2f", ($earned / $possible) * 100);
...

  $grade = $average = $earned = $possible = "?";
}
  2. or download this
    @GRADES   = qw( E  D- D  D+ C- C  C+ B- B  B+ A- A  );
@BRACKETS =   (    60,64,67,70,74,77,80,84,87,90,95 );
...

  $grade = $average = $earned = $possible = "?";
}
  3. or download this
    # prepare query
$cursor = $dbh->prepare('SELECT * FROM grades WHERE className=?');
...
}

...