diff --git a/lab-python-functions.ipynb b/lab-python-functions.ipynb
index 44d337b..74d368c 100644
--- a/lab-python-functions.ipynb
+++ b/lab-python-functions.ipynb
@@ -43,11 +43,116 @@
     "\n",
     "\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "28681018",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Total products ordered: 1\n",
+      "Percentage of products ordered: 20.00%\n",
+      "Updated Inventory:\n",
+      "t-shirt: 10\n",
+      "mug: 19\n",
+      "hat: 30\n",
+      "book: 40\n",
+      "keychain: 50\n"
+     ]
+    }
+   ],
+   "source": [
+    "#previous data\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "#step 1\n",
+    "\n",
+    "def initialize_inventory(products):\n",
+    "    for product in products:\n",
+    "        inventory[product] = int(input(f\"Enter the quantity for {product}: \"))\n",
+    "    return inventory\n",
+    "\n",
+    "#step 2\n",
+    "customer_orders = set()\n",
+    "def get_customer_orders():\n",
+    "    while True:\n",
+    "        p = input(\"Select a product to order:\")\n",
+    "        if p in customer_orders:\n",
+    "            print(\"You have already ordered this product.\")\n",
+    "        else:\n",
+    "            customer_orders.add(p)\n",
+    "        b = input(\"Do you want to order more? (yes/no): \")\n",
+    "        if b.lower() == \"no\":\n",
+    "            break\n",
+    "    return customer_orders\n",
+    "\n",
+    "#step 3\n",
+    "def update_inventory(customer_orders, inventory):\n",
+    "    for order in customer_orders:\n",
+    "        if order in inventory:\n",
+    "            inventory[order] -= 1\n",
+    "    return inventory\n",
+    "\n",
+    "#step 4\n",
+    "\n",
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    total_products_ordered = len(customer_orders)\n",
+    "    percentage_ordered = round((total_products_ordered / len(products)) * 100, 1)\n",
+    "    order_statistics = (total_products_ordered, percentage_ordered)\n",
+    "    return order_statistics\n",
+    "\n",
+    "#step 5\n",
+    "\n",
+    "def print_order_statistics(order_statistics):\n",
+    "    print(f\"Total products ordered: {order_statistics[0]}\")\n",
+    "    print(f\"Percentage of products ordered: {order_statistics[1]:.2f}%\")\n",
+    "    return order_statistics\n",
+    "\n",
+    "#step 6\n",
+    "def print_updated_inventory(inventory):\n",
+    "    print(\"Updated Inventory:\")\n",
+    "    for product in inventory:\n",
+    "        print(f\"{product}: {inventory[product]}\")\n",
+    "\n",
+    "# Main program\n",
+    "inventory = {}\n",
+    "initialize_inventory(products)#to set up quantities\n",
+    "get_customer_orders()#to record the order from the customer\n",
+    "update_inventory(customer_orders, inventory)#to update the inventory after the order\n",
+    "order_statistics = calculate_order_statistics(customer_orders, products)#calculate statistics\n",
+    "print_order_statistics(order_statistics)#to print statistics\n",
+    "print_updated_inventory(inventory)#to print the updated inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "id": "3708fc0f",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "(1, 20.0)"
+      ]
+     },
+     "execution_count": 18,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "calculate_order_statistics(customer_orders, products)\n"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -61,7 +166,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.9"
   }
  },
  "nbformat": 4,