diff --git a/lab-python-functions.ipynb b/lab-python-functions.ipynb
index 44d337b..47d64a2 100644
--- a/lab-python-functions.ipynb
+++ b/lab-python-functions.ipynb
@@ -43,6 +43,159 @@
     "\n",
     "\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "10c44d8c-7291-4705-a000-66f544b0efb3",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#1. initialize_inventory\n",
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "\n",
+    "    for item in products:\n",
+    "        quantity = int(input(f\"Enter {item} quantity: \"))\n",
+    "        inventory[item] = quantity\n",
+    "\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "620b51d6-2737-494b-ba9c-931bc1764c69",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#2. get_customer_orders\n",
+    "def get_customer_orders():\n",
+    "    customer_orders = set()\n",
+    "\n",
+    "    add_product = \"yes\"\n",
+    "\n",
+    "    while add_product == \"yes\":\n",
+    "        item = input(\"What would you like to order: t-shirt, mug, hat, book or keychain? \").lower()\n",
+    "\n",
+    "        if item in products:\n",
+    "            customer_orders.add(item)\n",
+    "        else:\n",
+    "            print(\"Invalid product or wrongly written. Please choose one from the list.\")\n",
+    "\n",
+    "        add_product = input(\"Do you want to add another product? (yes/no) \").lower()\n",
+    "\n",
+    "    return customer_orders"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "9a905fe9-167d-4ba4-98c2-b69d31708749",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#3. update_inventory\n",
+    "def update_inventory(customer_orders, inventory):\n",
+    "    for item in customer_orders:\n",
+    "        inventory[item] -= 1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "659838c5-89a5-40f9-8960-e690013459a0",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#4. calculate_order_statistics\n",
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    total_products_ordered = len(customer_orders)\n",
+    "    percentage_products_ordered = (total_products_ordered / len(products)) * 100\n",
+    "\n",
+    "    return total_products_ordered, percentage_products_ordered"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "id": "c8c3cb91-f714-42c5-b12d-5cc4afe4fedf",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#5. print_order_statistics\n",
+    "def print_order_statistics(order_statistics):\n",
+    "    total_products_ordered, percentage_products_ordered = order_statistics\n",
+    "\n",
+    "    labels = [\"Total Products Ordered:\", \"Percentage of Products Ordered:\"]\n",
+    "\n",
+    "    for label, value in zip(labels, order_statistics):\n",
+    "        print(label, value)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "id": "a011121b-67e1-43bf-b50f-f702b738802c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#6. print_updated_inventory\n",
+    "def print_updated_inventory(inventory):\n",
+    "    for item, quantity in inventory.items():\n",
+    "        print(item.title() + \":\", quantity)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "id": "03cda061-2ceb-44b6-b951-2d43a51e819d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter t-shirt quantity:  1\n",
+      "Enter mug quantity:  1\n",
+      "Enter hat quantity:  1\n",
+      "Enter book quantity:  1\n",
+      "Enter keychain quantity:  1\n",
+      "What would you like to order: t-shirt, mug, hat, book or keychain?  mug\n",
+      "Do you want to add another product? (yes/no)  yes\n",
+      "What would you like to order: t-shirt, mug, hat, book or keychain?  hat\n",
+      "Do you want to add another product? (yes/no)  no\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Total Products Ordered: 2\n",
+      "Percentage of Products Ordered: 40.0\n",
+      "T-Shirt: 1\n",
+      "Mug: 0\n",
+      "Hat: 0\n",
+      "Book: 1\n",
+      "Keychain: 1\n"
+     ]
+    }
+   ],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "inventory = initialize_inventory(products)\n",
+    "\n",
+    "customer_orders = get_customer_orders()\n",
+    "\n",
+    "order_statistics = calculate_order_statistics(customer_orders, products)\n",
+    "\n",
+    "print_order_statistics(order_statistics)\n",
+    "\n",
+    "update_inventory(customer_orders, inventory)\n",
+    "\n",
+    "print_updated_inventory(inventory)"
+   ]
   }
  ],
  "metadata": {
@@ -61,7 +214,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.14.6"
   }
  },
  "nbformat": 4,