diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..f1b7888 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,11 +72,157 @@
     "\n",
     "4. Test your code by running the program and deliberately entering invalid quantities and product names. Make sure the error handling mechanism works as expected.\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "aef49fe3",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "def initialize_inventory(product):\n",
+    "    inventory = {}\n",
+    "    for product in products:\n",
+    "        valid_input = False\n",
+    "        while not valid_input:\n",
+    "            try:\n",
+    "                quantity = int(input(f\"Enter quantity of {product}: \"))\n",
+    "                if quantity >= 0:\n",
+    "                    inventory[product] = quantity\n",
+    "                    valid_input = True\n",
+    "                else:\n",
+    "                    print(\"Quantity can not be negative. Please enter a valid quantity.\")\n",
+    "            except ValueError:\n",
+    "                print(\"Invalid input, Please enter a valid quantity.\")\n",
+    "\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "1a10a2c3",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Invalid input, Please enter a valid quantity.\n",
+      "Invalid input, Please enter a valid quantity.\n",
+      "Invalid input, Please enter a valid quantity.\n"
+     ]
+    }
+   ],
+   "source": [
+    "inventory = initialize_inventory(products)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "id": "4dbf62af",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_total_order_value(customer_orders):\n",
+    "    for products in customer_orders:\n",
+    "        Valid_input = False\n",
+    "        while not Valid_input:\n",
+    "            try:\n",
+    "                product_prices = float(input(f\"Enter price for {products}: \"))\n",
+    "                total_price = 0\n",
+    "                total_price += product_prices\n",
+    "\n",
+    "                if product_prices > 0:\n",
+    "                    Valid_input = True\n",
+    "                else:\n",
+    "                    print(\"Price cannot be 0 or negative. Please enter a valid price.\")\n",
+    "\n",
+    "            except ValueError:\n",
+    "                print(\"Invalid input, Please enter a valid price.\")\n",
+    "    return total_price"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 57,
+   "id": "fc910856",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_order():\n",
+    "    customer_orders = set()\n",
+    "    Valid_input = False\n",
+    "    while not Valid_input:\n",
+    "        try:\n",
+    "            num_orders = int(input(\"Enter the number of customer orders: \"))\n",
+    "            if num_orders > 0:\n",
+    "                Valid_input = True\n",
+    "            else:\n",
+    "                print(\"Number of orders must be positive. Please enter a valid number.\")\n",
+    "        except ValueError:\n",
+    "            print(\"Invalid input, Please enter a valid number.\")\n",
+    "\n",
+    "    for _ in range(num_orders):\n",
+    "        while True:\n",
+    "            try:\n",
+    "                product_ordered = input(\"Which product does customer order?\").strip().lower()\n",
+    "                if not product_ordered in products:\n",
+    "                    raise ValueError(\"Product not found in inventory.\")\n",
+    "                customer_orders.add(product_ordered)\n",
+    "                break  \n",
+    "            except ValueError:                        \n",
+    "                print(\"Product not found in inventory. Please enter a valid product.\")\n",
+    "    \n",
+    "    return customer_orders"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 56,
+   "id": "5dbaa242",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Product not found in inventory. Please enter a valid product.\n"
+     ]
+    }
+   ],
+   "source": [
+    "customer_orders = get_customer_order()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "8873ccb4",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Price cannot be 0 or negative. Please enter a valid price.\n",
+      "The total order value is: 90.0\n"
+     ]
+    }
+   ],
+   "source": [
+    "\n",
+    "total_price = calculate_total_order_value(customer_orders)\n",
+    "print(f\"The total order value is: {total_price}\")"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -90,7 +236,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,