diff --git a/lab-python-functions.ipynb b/lab-python-functions.ipynb
index 44d337b..54432c7 100644
--- a/lab-python-functions.ipynb
+++ b/lab-python-functions.ipynb
@@ -43,6 +43,156 @@
     "\n",
     "\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
+   "id": "200defb6-e54d-4685-b2b9-069f193b637c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def initialize_inventory (list_products):\n",
+    "    for product in list_products :\n",
+    "        quantity = int(input(f\"Enter the quantity of {product}: \"))\n",
+    "        inventory[product] = quantity\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "id": "f47515b1-dcf4-4f65-8d7d-953c31c0d80c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "\n",
+    "def get_customer_orders():\n",
+    "    customer_orders = set()\n",
+    "    customer_status = True\n",
+    "    while customer_status == True:\n",
+    "        customer_orders.add(input(f\"Enter the name of a product that the customer wants : {list_products}\"))\n",
+    "        customer_answer = (input(f\" Want to do another purchase, answser : yes or no\"))\n",
+    "        if customer_answer == \"yes\" :\n",
+    "            customer_status = True\n",
+    "        else :\n",
+    "            customer_status = False\n",
+    "            break\n",
+    "    return customer_orders"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 23,
+   "id": "71eaf890-b49f-468f-872a-0db03fdddb5f",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def update_inventory(customer_orders, inventory):\n",
+    "    for product in customer_orders:\n",
+    "        if product in inventory and inventory[product] > 0:\n",
+    "            inventory[product] -= 1\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "id": "28d6cde5-cc58-4f28-8e51-194f33dd7e71",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_order_statistics (customer_orders,list_products,inventory) :\n",
+    "    order_statistics = {}\n",
+    "    total_prod_ordered = len(customer_orders)\n",
+    "    order_statistics[\"total_prod_ordered\"] = total_prod_ordered\n",
+    "    \n",
+    "    total_inventory = sum(inventory.values())\n",
+    "    percentage_products_ordered = (total_prod_ordered / total_inventory)*100\n",
+    "    order_statistics [\"percentage_products_ordered\"] = percentage_products_ordered\n",
+    "    return order_statistics"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "id": "0b27bd5d-1d7d-46af-9326-0c5d4b486947",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def print_order_statistics (order_statistics):\n",
+    "    print(f\"Total Products Ordered: {order_statistics[\"total_prod_ordered\"]}.\")\n",
+    "    print(f\"Percentage of Products Ordered: {order_statistics[\"percentage_products_ordered\"]:.2f}%. \")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "id": "1aad97d7-d883-41ad-b3c2-d58116c87d81",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def print_updated_inventory (inventory) :\n",
+    "    print(f\"This is the inventory after customer order :\")\n",
+    "    for product, quantity in inventory.items():\n",
+    "        print (f\"{product} : {quantity}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 30,
+   "id": "08c098ac-4209-4627-8125-0e90b4aa140d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter the quantity of t-shirt:  1\n",
+      "Enter the quantity of mug:  2\n",
+      "Enter the quantity of hat:  3\n",
+      "Enter the quantity of book:  4\n",
+      "Enter the quantity of keychain:  5\n",
+      "Enter the name of a product that the customer wants : ['t-shirt', 'mug', 'hat', 'book', 'keychain'] mug\n",
+      " Want to do another purchase, answser : yes or no yes\n",
+      "Enter the name of a product that the customer wants : ['t-shirt', 'mug', 'hat', 'book', 'keychain'] hat\n",
+      " Want to do another purchase, answser : yes or no yes\n",
+      "Enter the name of a product that the customer wants : ['t-shirt', 'mug', 'hat', 'book', 'keychain'] book\n",
+      " Want to do another purchase, answser : yes or no no\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Total Products Ordered: 3.\n",
+      "Percentage of Products Ordered: 25.00%. \n",
+      "This is the inventory after customer order :\n",
+      "t-shirt : 1\n",
+      "mug : 1\n",
+      "hat : 2\n",
+      "book : 3\n",
+      "keychain : 5\n"
+     ]
+    }
+   ],
+   "source": [
+    "list_products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "inventory = {}\n",
+    "initialize_inventory(list_products)\n",
+    "customer_orders = get_customer_orders()\n",
+    "update_inventory(customer_orders, inventory)\n",
+    "order_statistics = calculate_order_statistics (customer_orders,list_products,inventory)\n",
+    "print_order_statistics (order_statistics)\n",
+    "print_updated_inventory (inventory)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ccf9fb62-6df1-49c0-ae16-6a6f09c6a72e",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
@@ -61,7 +211,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.12.7"
   }
  },
  "nbformat": 4,