diff --git a/store/models.py b/store/models.py
index 90f4d0c..be72075 100644
--- a/store/models.py
+++ b/store/models.py
@@ -464,7 +464,7 @@ class Checklist(models.Model):
         elif self.category_id:
             # Add commission of bottom-most category
             category_commission = getattr(self.category, 'commission', 0)
-            commission = self.price_rub / 100 * category_commission
+            commission = category_commission * self.price_rub / 100
         else:
             commission = GlobalSettings.load().commission_rub