----------test.php-------------------
<?
$a = 12.00;
$option1 = 138;
$option2 = 138;
$option3 = 168;
if(isset($_REQUEST['Submit'])){
$overseas=$_REQUEST['overseas'];
$destination=$_REQUEST['destination'];

if ($destination == "USA and Canada"){
    $total = $overseas * $a;
	$total2 = $option1 * $a;
	$total3 = $total2 - $total;
	header("Location: option1.php?$total3");
}else {
	$total = $overseas * $a;
	$total2 = $option3 * $a;
	$total3 = $total2 - $total;
	//echo  $total3;
	
	header("Location: option3.php");

}
}
?>
---------------------------------------------


----------option1.php-----------------------

you  spent <?php echo $_GET["$total3"]; ?> last year site 
--------------------------------------------