diff --git a/lab-python-list-comprehension.ipynb b/lab-python-list-comprehension.ipynb
index 5a3c3e1..640cbc0 100644
--- a/lab-python-list-comprehension.ipynb
+++ b/lab-python-list-comprehension.ipynb
@@ -75,11 +75,208 @@
     "\n",
     "```\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "46273357",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#products list\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "dc57dcaf",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def initialize_inventory(products): #defines the starting inventory and its products\n",
+    "    inventory = {}\n",
+    "    print(\"enter quantity for each product:\")\n",
+    "    for item in products:\n",
+    "        quantity = input(f\"  {item}: \")\n",
+    "        while not quantity.isdigit():\n",
+    "            print(\"Please enter a valid number.\")\n",
+    "            quantity = input(f\"  {item}: \")\n",
+    "        inventory[item] = int(quantity)\n",
+    "    return inventory #returns the initialized inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "id": "ea39718a",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "enter quantity for each product:\n",
+      "Please enter a valid number.\n",
+      "Initial inventory: {'t-shirt': 89, 'mug': 64, 'hat': 67, 'book': 567, 'keychain': 64}\n"
+     ]
+    }
+   ],
+   "source": [
+    "inventory = initialize_inventory(products)\n",
+    "print(\"Initial inventory:\", inventory)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "id": "edb69c3c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_costumer_orders(products):\n",
+    "    customer_orders = set()\n",
+    "    num_orders = input(\"How many different products would you like to order? \")\n",
+    "    while not num_orders.isdigit() or int(num_orders) <= 0:\n",
+    "        print(\"Please enter a valid positive number.\")\n",
+    "        num_orders = input(\"How many different products would you like to order? \")\n",
+    "    num_orders = int(num_orders)\n",
+    "    for _ in range(num_orders):\n",
+    "        product_name = input(f\"enter the product name: \").lower()\n",
+    "        if product_name in products:\n",
+    "            customer_orders.add(product_name)\n",
+    "        else:\n",
+    "            print(f\"{product_name} is not available.\")\n",
+    "    return customer_orders #returns the set of ordered products"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "id": "ce40dc01",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Customer orders: {'book', 'hat'}\n"
+     ]
+    }
+   ],
+   "source": [
+    "customer_orders = get_costumer_orders(products)\n",
+    "print(\"Customer orders:\", customer_orders)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "id": "b6e2fb59",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_order_statitics(customer_orders, products): #calculates the total items ordered and the average items per product\n",
+    "    total_products_ordered = len(customer_orders)\n",
+    "    percentage_ordered = (total_products_ordered / len(products)) * 100\n",
+    "    return total_products_ordered, percentage_ordered #returns the total items ordered and the average"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "id": "cdfbc4e6",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Order statistics: (2, 40.0)\n"
+     ]
+    }
+   ],
+   "source": [
+    "statistics = calculate_order_statitics(customer_orders, products)\n",
+    "print(\"Order statistics:\", statistics)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "id": "609ad155",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_total_price(customer_orders): #calculates the total price of the ordered products\n",
+    "    total_price = 0.0\n",
+    "    for p in customer_orders:\n",
+    "        price = input(f\"Enter the price for {p}: \")\n",
+    "        while not (price.replace('.','',1).isdigit() and price.count('.') <= 1):\n",
+    "            print(\"Please enter a valid price non negative.\")\n",
+    "            price = input(f\"Enter the price for {p}: \")\n",
+    "        total_price += float(price)\n",
+    "    return total_price #returns the total price of the order"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "id": "ae0128c4",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Total price of the order: €16.0\n"
+     ]
+    }
+   ],
+   "source": [
+    "total_price = calculate_total_price(customer_orders)\n",
+    "print(f\"Total price of the order: €{total_price}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "id": "977e8859",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def updated_inventory(inventory, customer_orders): #updates the inventory after an order is placed\n",
+    "    for item in customer_orders:\n",
+    "        if item in inventory and inventory[item] > 0:\n",
+    "            inventory[item] -= 1\n",
+    "        else:\n",
+    "            print(f\"Sorry, {item} is out of stock.\")\n",
+    "    return inventory #returns the updated inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "id": "cd637cba",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Updated inventory: {'t-shirt': 89, 'mug': 64, 'hat': 66, 'book': 566, 'keychain': 64}\n"
+     ]
+    }
+   ],
+   "source": [
+    "updated_inventory = updated_inventory(inventory, customer_orders)\n",
+    "print(\"Updated inventory:\", updated_inventory)"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -93,7 +290,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,