diff --git a/billing/utils.py b/billing/utils.py
new file mode 100644
index 0000000..321667f
--- /dev/null
+++ b/billing/utils.py
@@ -0,0 +1,33 @@
+def calculate_total_new_price(number_of_devices, number_of_months):
+    monthly_price_map = {
+        1: 100,
+        2: 175,
+        3: 250,
+        4: 325,
+        5: 400,
+        6: 475,
+        7: 550,
+        8: 625,
+        9: 700,
+        10: 775,
+        11: 850,
+        12: 925,
+        13: 1000,
+        14: 1075,
+        15: 1150,
+        16: 1225,
+        17: 1300,
+    }
+
+    if number_of_devices < 1 or number_of_devices > 17:
+        raise ValueError("Number of devices must be between 1 and 17.")
+
+    monthly_price = monthly_price_map[number_of_devices]
+    total_price = monthly_price * number_of_months
+    print(f"Monthly price for {number_of_devices} devices: {monthly_price}")
+
+    print(f"Total price for {number_of_months} months: {total_price}")
+    return total_price
+
+
+calculate_total_new_price(number_of_devices=2, number_of_months=3)
diff --git a/billing/views.py b/billing/views.py
index 1b129b6..2a75ab7 100644
--- a/billing/views.py
+++ b/billing/views.py
@@ -15,6 +15,7 @@ from api.tasks import add_new_devices_to_omada
 from apibase.env import BASE_DIR, env
 from django.db.models import Prefetch
 import logging
+from .utils import calculate_total_new_price
 
 from .models import Device, Payment, Topup, WalletTransaction
 from .serializers import (
@@ -103,8 +104,9 @@ class ListCreatePaymentView(StaffEditorPermissionMixin, generics.ListCreateAPIVi
                 {"message": "device_ids are required."},
                 status=status.HTTP_400_BAD_REQUEST,
             )
-        # Create payment
-        amount = 100
+        amount = calculate_total_new_price(
+            number_of_devices=number_of_devices, number_of_months=number_of_months
+        )
         payment = Payment.objects.create(
             amount=amount,
             number_of_months=number_of_months,