# How to calculate quantity and price in PHP?

```1   <!doctype html>
2   <html lang="en">
4      <meta charset="utf-8">
5      <title>Product Cost Calculator</
title>
6      <style type="text/css">
7         .number { font-weight: bold; }
8      </style>
10  <body>
11  <?php // Script 4.2 - handle_calc.php
12  /* This script takes values from
calculator.html and performs
13  total cost and monthly payment
calculations. */
14
15  // Address error handling, if you want.
16
17  // Get the values from the \$_POST array:
18  \$price = \$_POST['price'];
19  \$quantity = \$_POST['quantity'];
20  \$discount = \$_POST['discount'];
21  \$tax = \$_POST['tax'];
22  \$shipping = \$_POST['shipping'];
23  \$payments = \$_POST['payments'];
24
25  // Calculate the total:
26  \$total = \$price * \$quantity;
27  \$total = \$total + \$shipping;
28  \$total = \$total - \$discount;
29
30  // Determine the tax rate:
31  \$taxrate = \$tax / 100;
32  \$taxrate = \$taxrate + 1;
33
34  // Factor in the tax rate:
35  \$total = \$total * \$taxrate;
36
37  // Calculate the monthly payments:
38  \$monthly = \$total / \$payments;
39
40  // Print out the results:
41  print "<p>You have selected to
purchase:<br>
42  <span class=\"number\">\$quantity</
span> widget(s) at <br>
43  \$<span class=\"number\">\$price</span>
price each plus a <br>
44  \$<span class=\"number\">\$shipping</
span> shipping cost and a <br>
45  <span class=\"number\">\$tax</span>
percent tax rate.<br>
class=\"number\">\$discount</span>
discount, the total cost is
47  \$<span class=\"number\">\$total</
span>.<br>
48  Divided over <span
class=\"number\">\$payments</span>
monthly payments, that would be
\$<span class=\"number\">\$monthly</
span> each.</p>";
49
50  ?>
51  </body>
52  </html>```