Here’s how you can calculate the percent from a value.

<?php
/* Credits: http://www.bitrepository.com */

// example: number of employees in a company's department (Marketing)
$value = '20';
// total employees that company has
$total = '500'; 

$percent = number_format(($value * 100) / $total);

// percent of employees from the Marketing Department.
echo $percent.'%';
?>

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