note 85032 added to function.round

I have just stumbled across something weird... can any one shed some light on this? round( (33615 / 33333)*100 , 2) --> result: 100.85 round( (33615 / 33333)*100 , 2) - 100 --> result: 0.84999999999999 ---- Server IP: 87.124.64.96 Probable Submitter: 81.137.195.192 ---- Manual Page -- http://www.php.net/manual/en/function.round.php Edit -- https://master.php.net/note/edit/85032 Del: integrated -- https://master.php.net/note/delete/85032/integrated Del: useless -- https://master.php.net/note/delete/85032/useless Del: bad code -- https://master.php.net/note/delete/85032/bad+code Del: spam -- https://master.php.net/note/delete/85032/spam Del: non-english -- https://master.php.net/note/delete/85032/non-english Del: in docs -- https://master.php.net/note/delete/85032/in+docs Del: other reasons-- https://master.php.net/note/delete/85032 Reject -- https://master.php.net/note/reject/85032 Search -- https://master.php.net/manage/user-notes.php