diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..76d3ffd 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,11 +72,147 @@
     "\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": 1,
+   "id": "606a5213",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Only 3 hat(s) available.\n",
+      "Only 3 hat(s) available.\n",
+      "Product not found in inventory. Please try again.\n",
+      "Product not found in inventory. Please try again.\n",
+      "Only 4 mug(s) available.\n",
+      "\n",
+      "Order Statistics:\n",
+      "Total Products Ordered: 2\n",
+      "Percentage of Unique Products Ordered: 40.0\n",
+      "\n",
+      "Updated Inventory:\n",
+      "t-shirt: 5\n",
+      "mug: 1\n",
+      "hat: 1\n",
+      "book: 2\n",
+      "keychain: 1\n",
+      "Total Price: {'hat': 10.0, 'mug': 5.0}\n"
+     ]
+    }
+   ],
+   "source": [
+    "#1.\n",
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "    for product in products:\n",
+    "        valid_quantity = False\n",
+    "        while not valid_quantity:\n",
+    "            try:\n",
+    "                quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n",
+    "                if quantity < 0:\n",
+    "                    raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n",
+    "                valid_quantity = True\n",
+    "            except ValueError as error:\n",
+    "                print(f\"Error: {error}\")\n",
+    "        inventory[product] = quantity\n",
+    "    return inventory\n",
+    "\n",
+    "#3.\n",
+    "def get_customer_orders(inventory):\n",
+    "    orders = {}\n",
+    "    while True:\n",
+    "        try:\n",
+    "            num_orders = int(input(\"How many different products would you like to order? \"))\n",
+    "            if num_orders < 0:\n",
+    "                print(\"Number of orders cannot be negative.\")\n",
+    "            else:\n",
+    "                break\n",
+    "        except ValueError:\n",
+    "            print(\"Invalid input. Please enter a number.\")\n",
+    "    for i in range(num_orders):\n",
+    "        while True:\n",
+    "            product_name = input(f\"Enter the name of product #{i + 1}: \")\n",
+    "            if product_name not in inventory:\n",
+    "                print(\"Product not found in inventory. Please try again.\")\n",
+    "            elif inventory[product_name] <= 0:\n",
+    "                print(f\"Sorry, {product_name} is out of stock.\")\n",
+    "            else:\n",
+    "                while True:\n",
+    "                    try:\n",
+    "                        quantity = int(input(f\"How many {product_name}s do you want to order? \"))\n",
+    "                        if quantity < 0:\n",
+    "                            print(\"Quantity cannot be negative\")\n",
+    "                        elif quantity > inventory[product_name]:\n",
+    "                            print(f\"Only {inventory[product_name]} {product_name}(s) available.\")\n",
+    "                        else:\n",
+    "                            orders[product_name] = quantity\n",
+    "                            inventory[product_name] -= quantity\n",
+    "                            break\n",
+    "                    except ValueError:\n",
+    "                        print(\"Please enter a valid number.\")\n",
+    "                break\n",
+    "    return orders\n",
+    "\n",
+    "#\n",
+    "def update_inventory(customer_orders, inventory):\n",
+    "    for item in customer_orders:\n",
+    "        if item in inventory:\n",
+    "            inventory[item] -= 1\n",
+    "    return {product: quantity for product, quantity in inventory.items() if quantity > 0}\n",
+    "\n",
+    "#\n",
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    total = len(customer_orders)\n",
+    "    percent = (total / len(products)) * 100\n",
+    "    return total, round(percent, 2)\n",
+    "\n",
+    "def print_order_statistics(stats):\n",
+    "    print(\"\\nOrder Statistics:\")\n",
+    "    print(\"Total Products Ordered:\", stats[0])\n",
+    "    print(\"Percentage of Unique Products Ordered:\", stats[1])\n",
+    "\n",
+    "def print_updated_inventory(inventory):\n",
+    "    print(\"\\nUpdated Inventory:\")\n",
+    "    [print(f\"{item}: {quantity}\") for item, quantity in inventory.items()]\n",
+    "\n",
+    "#2.\n",
+    "def calculate_total_price(inventory):\n",
+    "    prices = {}\n",
+    "    for product in inventory:\n",
+    "        while True:\n",
+    "            try:\n",
+    "                price = float(input(f\"Enter the price for {product}: €\"))\n",
+    "                if price < 0:\n",
+    "                    print(\"Price cannot be negative. Please enter a valid price.\")\n",
+    "                else:\n",
+    "                    prices[product] = price\n",
+    "                    break\n",
+    "            except ValueError:\n",
+    "                print(\"Invalid input. Please enter a number.\")\n",
+    "    return prices\n",
+    "\n",
+    "#\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "inventory = initialize_inventory(products)\n",
+    "customer_orders = get_customer_orders(inventory)\n",
+    "inventory = update_inventory(customer_orders, inventory)\n",
+    "stats = calculate_order_statistics(customer_orders, products)\n",
+    "\n",
+    "print_order_statistics(stats)\n",
+    "print_updated_inventory(inventory)\n",
+    "\n",
+    "total_price = calculate_total_price(customer_orders)\n",
+    "print(\"Total Price:\", total_price)"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -90,7 +226,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,