From fe86e0cbfe5fbd659dbe916d134a3f4a1ea1b76c Mon Sep 17 00:00:00 2001
From: Tobias <tobias@localhost.localdomain>
Date: Mon, 1 Oct 2018 10:11:36 +1300
Subject: [PATCH] Update GST tag

---
 pinaxcon/templatetags/lca2018_tags.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pinaxcon/templatetags/lca2018_tags.py b/pinaxcon/templatetags/lca2018_tags.py
index 8620bc10..be27e8ed 100644
--- a/pinaxcon/templatetags/lca2018_tags.py
+++ b/pinaxcon/templatetags/lca2018_tags.py
@@ -71,8 +71,9 @@ def presentation_bg_number(presentation, count):
 
 @register.filter()
 def gst(amount):
-    two_places = Decimal(10) ** -2
-    return Decimal(amount / 11).quantize(two_places)
+    GST_RATE = Decimal('0.15')
+    value_no_gst = Decimal(amount / (1 + GST_RATE))
+    return Decimal(amount - value_no_gst).quantize(Decimal('0.01'))
 
 
 @register.simple_tag()