<?php

$d = array(5, 6.5, 10, 3.355, 400, 9.43);
function change($c, $array)
{
	foreach($array as $key=> $value)
	{
		$array[$key] = $value + $value * $c / 100;
	}
	return $array;
}
$d = change(2, $d);
echo '<pre>';
print_r($d);
echo '</pre>';