code
<?php $score=84; if($score<50){ echo 'grade 0'; }else if ($score <55){ echo 'grade 1'; }else if ($score <60){ echo 'grade 1.5'; }else if ($score <65){ echo 'grade 2'; }else if ($score <70){ echo 'grade 2.5'; }else if ($score <75){ echo 'grade 3'; }else if ($score <80){ echo 'grade 3.5'; }else{echo 'grade 4';} ?>