diff --git a/lab-oop_in_python.ipynb b/lab-oop_in_python.ipynb
index 3142c5e..e2e115b 100644
--- a/lab-oop_in_python.ipynb
+++ b/lab-oop_in_python.ipynb
@@ -30,17 +30,27 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "200 15000\n"
+     ]
+    }
+   ],
    "source": [
     "# Your code here\n",
     "class Vehicle:\n",
     "    # Hint: Define __init__ method with parameters for max_speed and mileage\n",
-    "    pass\n",
+    "    def __init__(self, max_speed, mileage):\n",
+    "        self.max_speed = max_speed\n",
+    "        self.mileage = mileage\n",
     "\n",
     "# Example instantiation\n",
-    "modelX = Vehicle()  # Create an instance of Vehicle\n",
+    "modelX = Vehicle(200, 15000)  # Create an instance of Vehicle\n",
     "\n",
     "# Print attributes\n",
     "print(modelX.max_speed, modelX.mileage)  # Expected output: (value of max_speed, value of mileage)"
@@ -87,7 +97,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -101,7 +111,9 @@
    "source": [
     "# Your code here\n",
     "class Bus(Vehicle):\n",
-    "    pass\n",
+    "    def __init__(self, seating_capacity=20, standing_capacity=10):\n",
+    "        self.seating_capacity = seating_capacity\n",
+    "        self.standing_capacity = standing_capacity\n",
     "\n",
     "# Example instantiation\n",
     "school_bus = Bus()\n",
@@ -118,26 +130,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 23,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Base fare\n"
+      "110\n"
      ]
     }
    ],
    "source": [
     "# Your code here\n",
     "class Vehicle:\n",
+    "    def __init__(self, base_fare=100):\n",
+    "        self.base_fare = base_fare    \n",
+    "        \n",
     "    def fare(self):\n",
-    "        return \"Base fare\"\n",
+    "        return self.base_fare\n",
     "\n",
     "class Bus(Vehicle):\n",
-    "    # Hint: Override fare method to include extra charges\n",
-    "    pass\n",
+    "    MAINTENANCE_CHARGE = 10\n",
+    "\n",
+    "    def __init__(self, base_fare=100):\n",
+    "        super().__init__(base_fare)\n",
+    "\n",
+    "    def fare(self):\n",
+    "        return super().fare() + Bus.MAINTENANCE_CHARGE\n",
     "\n",
     "school_bus = Bus()\n",
     "print(school_bus.fare())  # Expected output: \"Base fare with extra charge\""
@@ -153,7 +173,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 16,
    "metadata": {},
    "outputs": [
     {
@@ -167,7 +187,7 @@
    "source": [
     "# Your code here\n",
     "class Vehicle:\n",
-    "    color = \"White\"  # Hint: Define color as a class attribute\n",
+    "    COLOR = \"White\"  # Hint: Define color as a class attribute\n",
     "\n",
     "    def __init__(self, name, max_speed, mileage):\n",
     "        self.name = name\n",
@@ -175,7 +195,7 @@
     "        self.mileage = mileage\n",
     "\n",
     "school_bus = Vehicle(\"School Volvo\", 180, 12)\n",
-    "print(school_bus.color)  # Expected output: \"White\""
+    "print(school_bus.COLOR)  # Expected output: \"White\""
    ]
   },
   {
@@ -188,7 +208,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {},
    "outputs": [
     {
@@ -211,9 +231,12 @@
     "        return self.capacity * 100\n",
     "\n",
     "class Bus(Vehicle):\n",
-    "    # Hint: Override fare method to include maintenance charge\n",
-    "    pass\n",
+    "        def __init__(self, name, mileage, capacity):\n",
+    "            super().__init__(name, mileage, capacity)\n",
     "\n",
+    "        def fare(self):\n",
+    "            return super().fare() * 1.1\n",
+    "    \n",
     "school_bus = Bus(\"School Volvo\", 12, 50)\n",
     "print(\"Total Bus fare is:\", school_bus.fare())  # Expected output: Total Bus fare is: (calculated amount)"
    ]
@@ -228,7 +251,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [
     {
@@ -255,7 +278,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 20,
    "metadata": {},
    "outputs": [
     {
@@ -287,7 +310,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": ".venv",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -301,7 +324,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.0"
+   "version": "3.13.9"
   }
  },
  "nbformat": 4,