diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..3effbc8 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -8,6 +8,145 @@
     "# Lab | Error Handling"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Step 1: Initialize inventory with error handling\n",
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "\n",
+    "    for product in products:\n",
+    "        while True:\n",
+    "            try:\n",
+    "                quantity = int(input(f\"Enter the quantity available for {product}: \"))\n",
+    "\n",
+    "                if quantity < 0:\n",
+    "                    raise ValueError(\"Quantity cannot be negative.\")\n",
+    "\n",
+    "                inventory[product] = quantity\n",
+    "                break\n",
+    "\n",
+    "            except ValueError as error:\n",
+    "                print(\"Error:\", error)\n",
+    "                print(\"Please enter a valid non-negative number.\")\n",
+    "\n",
+    "    return inventory\n",
+    "\n",
+    "\n",
+    "# Step 2: Calculate total price with error handling\n",
+    "def calculate_total_price(customer_orders):\n",
+    "    prices = {}\n",
+    "\n",
+    "    for product in customer_orders:\n",
+    "        while True:\n",
+    "            try:\n",
+    "                price = float(input(f\"Enter the price for {product}: \"))\n",
+    "\n",
+    "                if price < 0:\n",
+    "                    raise ValueError(\"Price cannot be negative.\")\n",
+    "\n",
+    "                prices[product] = price\n",
+    "                break\n",
+    "\n",
+    "            except ValueError as error:\n",
+    "                print(\"Error:\", error)\n",
+    "                print(\"Please enter a valid price.\")\n",
+    "\n",
+    "    total_price = sum(prices.values())\n",
+    "    return total_price\n",
+    "\n",
+    "\n",
+    "# Step 3: Get customer orders with error handling\n",
+    "def get_customer_orders(inventory):\n",
+    "\n",
+    "    while True:\n",
+    "        try:\n",
+    "            num_orders = int(input(\"Enter the number of customer orders: \"))\n",
+    "\n",
+    "            if num_orders <= 0:\n",
+    "                raise ValueError(\"Number of orders must be greater than 0.\")\n",
+    "\n",
+    "            break\n",
+    "\n",
+    "        except ValueError as error:\n",
+    "            print(\"Error:\", error)\n",
+    "\n",
+    "    customer_orders = set()\n",
+    "\n",
+    "    while len(customer_orders) < num_orders:\n",
+    "        try:\n",
+    "            product = input(\"Enter product name: \")\n",
+    "\n",
+    "            if product not in inventory:\n",
+    "                raise ValueError(\"Product not found in inventory.\")\n",
+    "\n",
+    "            if inventory[product] <= 0:\n",
+    "                raise ValueError(\"Product is out of stock.\")\n",
+    "\n",
+    "            customer_orders.add(product)\n",
+    "\n",
+    "        except ValueError as error:\n",
+    "            print(\"Error:\", error)\n",
+    "            print(\"Please enter a valid product.\")\n",
+    "\n",
+    "    return customer_orders\n",
+    "\n",
+    "\n",
+    "# Update inventory after order\n",
+    "def update_inventory(customer_orders, inventory):\n",
+    "    for product in customer_orders:\n",
+    "        inventory[product] -= 1\n",
+    "\n",
+    "    # remove products with 0 quantity\n",
+    "    inventory = {product: quantity for product, quantity in inventory.items() if quantity > 0}\n",
+    "\n",
+    "    return inventory\n",
+    "\n",
+    "\n",
+    "# Calculate order statistics\n",
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    total_products_ordered = len(customer_orders)\n",
+    "    percentage_ordered = (total_products_ordered / len(products)) * 100\n",
+    "    return total_products_ordered, percentage_ordered\n",
+    "\n",
+    "\n",
+    "# Print order statistics\n",
+    "def print_order_statistics(order_statistics):\n",
+    "    print(\"\\nOrder Statistics\")\n",
+    "    print(\"Total products ordered:\", order_statistics[0])\n",
+    "    print(\"Percentage of products ordered:\", order_statistics[1], \"%\")\n",
+    "\n",
+    "\n",
+    "# Print updated inventory\n",
+    "def print_updated_inventory(inventory):\n",
+    "    print(\"\\nUpdated Inventory\")\n",
+    "    for product, quantity in inventory.items():\n",
+    "        print(product, \":\", quantity)\n",
+    "\n",
+    "\n",
+    "# Main Program\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "inventory = initialize_inventory(products)\n",
+    "\n",
+    "customer_orders = get_customer_orders(inventory)\n",
+    "\n",
+    "inventory = update_inventory(customer_orders, inventory)\n",
+    "\n",
+    "order_statistics = calculate_order_statistics(customer_orders, products)\n",
+    "\n",
+    "print_order_statistics(order_statistics)\n",
+    "\n",
+    "print_updated_inventory(inventory)\n",
+    "\n",
+    "total_price = calculate_total_price(customer_orders)\n",
+    "\n",
+    "print(\"\\nTotal price of the customer order:\", total_price)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b",