Intenta con esto!
Código PHP:
<html>
<head>
<title>Formulario de pedido de libros</title>
</head>
<body>
<h1>Librería Online </h1>
<h2>Resumen del Pedido </h2>
<?
$actionqty=$_POST['actionqty'];
$photoqty=$_POST['photoqty'];
$flashqty=$_POST['flashqty'];
echo "<p>Pedido procesado el "; // Start printing order
echo date("jS F,H:i ");
echo "<br>";
echo "<p>Su pedido es el siguiente:";
echo "<br>";
echo $actionqty." ActionScript<br>";
echo $photoqty." Photoshop<br>";
echo $flashqty." Flash MX<br>";
$totalqty = 0;
$totalamount = 0.00;
define("ACTIONPRICE", 100);
define("PHOTOPRICE", 10);
define("FLASHPRICE", 4);
$totalqty = $actionqty + $photoqty + $flashqty;
$totalamount = $actionqty * ACTIONPRICE
+ $photoqty * PHOTOPRICE
+ $flashqty * FLASHPRICE;
echo "<br>\n";
echo "Artículos Pedidos: ".$totalqty."<br>\n";
echo "Subtotal: €";
echo number_format($totalamount, 2);
echo "<br>\n";
$taxrate = 0.10; // local sales tax is 10%
$totalamount = $totalamount * (1 + $taxrate);
$totalamount = number_format($totalamount, 2);
echo "Total incluyendo impuestos: €".$totalamount."<br>\n";
?>
</body>
</html>