Hola el formulario
Código HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Calcular el IVA del tota</title>
<style type="text/css">
.titulo {
color: #06F;
font-size: 24px;
}
</style>
</head>
<body class="titulo">
<h1 align="center">Calcular el IVA del total</h1>
<table align="center" border="2" bordercolor="#CC0000">
<tr><td>
<form action="respuesta.php" method="post">
<input type="text" name="total" max="20" maxlength="8" /> Total
<input type="submit" value="enviar" /> 8%
</form>
</td></tr>
</table>
</body>
</html>