diff --git a/store/models.py b/store/models.py
index d245b20..bed5970 100644
--- a/store/models.py
+++ b/store/models.py
@@ -356,7 +356,7 @@ class Checklist(models.Model):
             # We assume that working promocode was bound correctly through serializer
             # and intentionally don't check if promocode is active here
             promocode = self.promocode
-            price -= promocode.discount * self.price_rub
+            price -= promocode.discount * self.price_rub / 100
 
             free_delivery = promocode.free_delivery
             no_comission = promocode.no_comission
@@ -367,7 +367,7 @@ class Checklist(models.Model):
         if not no_comission:
             price += self.commission_rub
 
-        return price
+        return Decimal.max(Decimal(0), price)
 
     @property
     def delivery_price_CN_RU(self) -> Decimal: