diff --git a/lab-python-functions.ipynb b/lab-python-functions.ipynb
index 44d337b..35cae63 100644
--- a/lab-python-functions.ipynb
+++ b/lab-python-functions.ipynb
@@ -43,11 +43,157 @@
     "\n",
     "\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "308032c0",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#1\n",
+    "def initialize_inventory (products):\n",
+    "    # dictionary\n",
+    "    inventory = {}\n",
+    "    # quantity\n",
+    "    for product in products:\n",
+    "        quantity = input (f\"Could you, please, let us know what is the quantity available in stock for {product}?\")\n",
+    "        while not quantity.isdigit():\n",
+    "            quantity = input (f\"Wrong format. Please insert a valid quantity for {product}!\")\n",
+    "        print (f\"Available {quantity} {product}!\")\n",
+    "        inventory.update({product: int(quantity)})\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "83778fdd",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#2\n",
+    "def get_customer_orders ():\n",
+    "    choice = \"yes\"\n",
+    "    customer_orders = set() \n",
+    "    while choice != \"no\":\n",
+    "        preference = input (f\"Could you, please, tell us a product you would like to buy?\")\n",
+    "        if not (preference in products):\n",
+    "            print(f\"Product not available. Please insert a product in {products}!\")\n",
+    "        else:\n",
+    "            customer_orders.add(preference)\n",
+    "            choice = input (f\"Do you want to continue shopping? yes or no?\").lower()\n",
+    "            print (f\"You chose: {preference}.\")\n",
+    "    return customer_orders"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "f8c4c388",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#3\n",
+    "def update_inventory (customer_orders, inventory):\n",
+    "    for product in customer_orders:\n",
+    "        inventory.update({product: inventory[product]-1})\n",
+    "        print (f\"The quantity of {product} is {inventory[product]}.\\n\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "7e4a5dfa",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#4\n",
+    "def calculate_order_statistics (customer_orders, products):\n",
+    "    total_products_ordered = len(customer_orders)\n",
+    "    print (f\"The total of products ordered is {total_products_ordered}.\")\n",
+    "\n",
+    "    # Percentage ordered\n",
+    "    total_inventory = sum(inventory.values())\n",
+    "    percentage_ordered = (total_products_ordered / total_inventory) *100\n",
+    "    return total_products_ordered, percentage_ordered"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "abbb6ef2",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#5\n",
+    "def print_order_statistics (order_statistics):\n",
+    "    print(f\"Order Statistics: \\n Total Products Ordered: {order_statistics[0]}\\n Percentage of Products Ordered: {order_statistics[1]} %.\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "339ef942",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#6\n",
+    "def print_updated_inventory(inventory, customer_orders):\n",
+    "    # update inventory\n",
+    "    update_inventory(customer_orders = customer_orders, inventory = inventory)\n",
+    "    print(f\"The updated inventory is {inventory}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "id": "fadc6fba",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Available 98 t-shirt!\n",
+      "Available 67 mug!\n",
+      "Available 34 hat!\n",
+      "Available 78 book!\n",
+      "Available 54 keychain!\n",
+      "{'t-shirt': 98, 'mug': 67, 'hat': 34, 'book': 78, 'keychain': 54}\n",
+      "You chose: book.\n",
+      "You chose: mug.\n",
+      "You chose: hat.\n",
+      "The total of products ordered is 3.\n",
+      "(3, 0.906344410876133)\n",
+      "The quantity of book is 77.\n",
+      "\n",
+      "The quantity of mug is 66.\n",
+      "\n",
+      "The quantity of hat is 33.\n",
+      "\n",
+      "The updated inventory is {'t-shirt': 98, 'mug': 66, 'hat': 33, 'book': 77, 'keychain': 54}\n"
+     ]
+    }
+   ],
+   "source": [
+    "#7\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "inventory = initialize_inventory(products)\n",
+    "print (inventory)\n",
+    "\n",
+    "customer_orders = get_customer_orders () \n",
+    "\n",
+    "order_statistics = calculate_order_statistics(customer_orders, products) \n",
+    "print(order_statistics)\n",
+    "\n",
+    "print_updated_inventory(inventory, customer_orders)"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -61,7 +207,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.14.0"
   }
  },
  "nbformat": 4,