My IF ELSE

<?php
$score=86;
if($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';}

?>