<?php
$score=100;
if($score<50){
echo'grade0';
}else if($score<60){
echo'grade1';
}else if($score<65){
echo'grade1.5';
}else if($score<70){
echo'grade2';
}else if($score<75){
echo'grade3';
}else if($score<80){
echo'grade3.5';
}else {echo'grade4';}
?>
