diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..5a8f661 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,11 +72,164 @@
     "\n",
     "4. Test your code by running the program and deliberately entering invalid quantities and product names. Make sure the error handling mechanism works as expected.\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 32,
+   "id": "fafb9721",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "    for product in products:\n",
+    "        valid_quantity = False\n",
+    "        while not valid_quantity:\n",
+    "            try:\n",
+    "                quantity = int(input(f\"Enter the quantity of {product}s available in stock: \"))\n",
+    "                if quantity < 0:\n",
+    "                    raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n",
+    "                valid_quantity = True\n",
+    "            except ValueError as error:\n",
+    "                print(f\"Error: {error}\")\n",
+    "        inventory[product] = quantity\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "4fb44703",
+   "metadata": {},
+   "source": [
+    "Answer 2:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 33,
+   "id": "52914694",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_total_price(customer_orders):\n",
+    "    prices = {}\n",
+    "    total_price = 0\n",
+    "\n",
+    "    for product, quantity in customer_orders.items(): \n",
+    "        while True:\n",
+    "            try:\n",
+    "                price_input = input(f\"Enter the price for {product}: \")\n",
+    "                price = float(price_input)\n",
+    "                if price < 0:\n",
+    "                    raise ValueError(\"Price cannot be negative.\")\n",
+    "                prices[product] = price\n",
+    "                break\n",
+    "            except ValueError:\n",
+    "                print(\"Invalid price! Please enter a valid number.\")\n",
+    "        \n",
+    "        total_price += price * quantity\n",
+    "\n",
+    "    print(f\"Total Order Price: {total_price}\")\n",
+    "    return total_price\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "5ac9e438",
+   "metadata": {},
+   "source": [
+    "Answer 3:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 34,
+   "id": "8ee4a7a1",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_orders(inventory):\n",
+    "    orders = {}\n",
+    "\n",
+    "    while True:\n",
+    "        product = input(\"Enter a product name (or 'done' to finish): \").strip()\n",
+    "\n",
+    "        if product.lower() == 'done':\n",
+    "            break\n",
+    "\n",
+    "        try:\n",
+    "            if product not in inventory:\n",
+    "                raise KeyError(f\"Product '{product}' not found in inventory.\")\n",
+    "            if inventory[product] <= 0:\n",
+    "                raise ValueError(f\"Product '{product}' is out of stock.\")\n",
+    "\n",
+    "            while True:\n",
+    "                try:\n",
+    "                    quantity_input = input(f\"Enter the quantity of '{product}' ordered: \")\n",
+    "                    quantity = int(quantity_input)\n",
+    "                    if quantity <= 0:\n",
+    "                        raise ValueError(\"Quantity must be a positive number.\")\n",
+    "                    if quantity > inventory[product]:\n",
+    "                        raise ValueError(f\"Only {inventory[product]} units of '{product}' are available.\")\n",
+    "                    orders[product] = quantity\n",
+    "                    break \n",
+    "                except ValueError as error:\n",
+    "                    print(f\"Error: {error} \")\n",
+    "        \n",
+    "        except (KeyError, ValueError) as error:\n",
+    "            print(f\"Error: {error} \")\n",
+    "    return orders\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "71361431",
+   "metadata": {},
+   "source": [
+    "Answer 4:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 35,
+   "id": "9fc619dd",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Error: invalid literal for int() with base 10: 'two'\n",
+      "Error: invalid literal for int() with base 10: 'one'\n",
+      "Error: \"Product 'hatt' not found in inventory.\" \n",
+      "Error: Only 4 units of 'hat' are available. \n",
+      "Error: Only 1 units of 'mug' are available. \n",
+      "Total Order Price: 30.0\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "30.0"
+      ]
+     },
+     "execution_count": 35,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\"]\n",
+    "inventory = initialize_inventory(products)\n",
+    "customer_orders = get_customer_orders(inventory)\n",
+    "\n",
+    "calculate_total_price(customer_orders)"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -90,7 +243,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,