diff --git a/lab-oop_in_python.ipynb b/lab-oop_in_python.ipynb
index 3142c5e..24097db 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": [
+      "250 8\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: int, mileage: int):\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(250, 8)  # 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)"
@@ -56,7 +66,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -70,7 +80,8 @@
    "source": [
     "# Your code here\n",
     "class Vehicle:\n",
-    "    pass\n",
+    "    def __init__(self):\n",
+    "        pass\n",
     "\n",
     "# Example instantiation\n",
     "my_vehicle = Vehicle()\n",
@@ -87,7 +98,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
@@ -101,7 +112,8 @@
    "source": [
     "# Your code here\n",
     "class Bus(Vehicle):\n",
-    "    pass\n",
+    "    def __init__(self):\n",
+    "        pass\n",
     "\n",
     "# Example instantiation\n",
     "school_bus = Bus()\n",
@@ -118,14 +130,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 12,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Base fare\n"
+      "Base fare with extra charge\n"
      ]
     }
    ],
@@ -136,8 +148,11 @@
     "        return \"Base fare\"\n",
     "\n",
     "class Bus(Vehicle):\n",
-    "    # Hint: Override fare method to include extra charges\n",
-    "    pass\n",
+    "    def __init__(Vehicle):\n",
+    "        pass\n",
+    "\n",
+    "    def fare(self):\n",
+    "        return \"Base fare with extra charge\"\n",
     "\n",
     "school_bus = Bus()\n",
     "print(school_bus.fare())  # Expected output: \"Base fare with extra charge\""
@@ -153,7 +168,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 13,
    "metadata": {},
    "outputs": [
     {
@@ -167,12 +182,13 @@
    "source": [
     "# Your code here\n",
     "class Vehicle:\n",
-    "    color = \"White\"  # Hint: Define color as a class attribute\n",
+    "    DEFAULT_COLOR = \"White\"  # Hint: Define color as a class attribute\n",
     "\n",
-    "    def __init__(self, name, max_speed, mileage):\n",
+    "    def __init__(self, name, max_speed, mileage, color=DEFAULT_COLOR):\n",
     "        self.name = name\n",
     "        self.max_speed = max_speed\n",
     "        self.mileage = mileage\n",
+    "        self.color = color\n",
     "\n",
     "school_bus = Vehicle(\"School Volvo\", 180, 12)\n",
     "print(school_bus.color)  # Expected output: \"White\""
@@ -188,14 +204,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 17,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Total Bus fare is: 5000\n"
+      "Total Bus fare is: 5500.0\n"
      ]
     }
    ],
@@ -211,8 +227,16 @@
     "        return self.capacity * 100\n",
     "\n",
     "class Bus(Vehicle):\n",
-    "    # Hint: Override fare method to include maintenance charge\n",
-    "    pass\n",
+    "\n",
+    "    MAINTENANCE_CHARGE_DEFAULT = 0.1\n",
+    "\n",
+    "    def __init__(self, name, mileage, capacity):\n",
+    "        super().__init__(name, mileage, capacity)\n",
+    "    \n",
+    "    def fare(self):\n",
+    "        base_fare = super().fare()\n",
+    "        maintenance_charge = base_fare * self.MAINTENANCE_CHARGE_DEFAULT\n",
+    "        return base_fare + maintenance_charge\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 +252,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 18,
    "metadata": {},
    "outputs": [
     {
@@ -255,7 +279,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [
     {
@@ -287,7 +311,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": ".venv",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -301,7 +325,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.0"
+   "version": "3.13.7"
   }
  },
  "nbformat": 4,