PHP comparsion fails with floats in 5.3.15 & 5.3.16

$total = '229.5';
$t = floatval($total) * floatval('0.20');
$taxed = $total - $t;

if ($taxed < 99) {
       print 1;
       $admin = $taxed - 10;
       $charge = 10;
} elseif (($taxed >= 99) && ($total < 199)) {
       $admin = $taxed - 15;
       $charge = 15;
       print 2;
} elseif ($taxed >= 199) {
       $admin = $taxed - 20;
       $charge = 20;
       print 3;
} else {
       print "Error";
}


print $admin;
print "<br />";
print $charge;