<?php
$score=77;
if($score < 50){
echo 'grade 0';
}else if ($score <56){
echo 'grade 1';
}else if ($score <60){
echo 'grade 1.5';
}else if ($score <66){
echo 'grade 2';
}else if ($score <70){
echo 'grade 2.5';
}else if ($score <76){
echo 'grade 3';
}else if ($score <80){
echo 'grade 3.5';
}else{echo'grade4';}
?>
