diff --git a/foundation/erpnext_foundation/web_form/buy_tickets_paypal/buy_tickets_paypal.js b/foundation/erpnext_foundation/web_form/buy_tickets_paypal/buy_tickets_paypal.js
index 63c971b4..cace2bb3 100644
--- a/foundation/erpnext_foundation/web_form/buy_tickets_paypal/buy_tickets_paypal.js
+++ b/foundation/erpnext_foundation/web_form/buy_tickets_paypal/buy_tickets_paypal.js
@@ -2,8 +2,8 @@ frappe.ready(function() {
 	// bind events here
 	var calculate = function() {
 		var amount =
-			(parseInt($('input[name="full_conference_tickets"]').val() || 0) * 10)
-			+ (parseInt($('input[name="user_conference_tickets"]').val() || 0) * 50);
+			(parseInt($('input[name="full_conference_tickets"]').val() || 0) * 50)
+			+ (parseInt($('input[name="user_conference_tickets"]').val() || 0) * 10);
 		$('input[name="amount"]').val(amount);
 		$('input[name="amount"]').closest('.form-group').toggleClass('has-error', amount == 0);
 	};