<?php

$a = [0.06,0.0025,0.0225,0.01];

$s = array_sum($a);
echo $s . "\n";

echo number_format($s, 2, '.', '');

Output for 8.4.1 - 8.4.5
    0.095
    0.09

Output for 8.2.0 - 8.2.28, 8.3.0 - 8.3.19
    0.095
    0.10