diff --git a/lab-oop_in_python.ipynb b/lab-oop_in_python.ipynb
index 3142c5e..6a35126 100644
--- a/lab-oop_in_python.ipynb
+++ b/lab-oop_in_python.ipynb
@@ -30,18 +30,32 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 9,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "70 100\n"
+     ]
+    }
+   ],
    "source": [
     "# Your code here\n",
     "class Vehicle:\n",
-    "    # Hint: Define __init__ method with parameters for max_speed and mileage\n",
-    "    pass\n",
     "\n",
-    "# Example instantiation\n",
-    "modelX = Vehicle()  # Create an instance of Vehicle\n",
+    "    description = \"This is a car\"\n",
+    "    # Constructor: Define __init__ method with parameters for max_speed and mileage\n",
+    "    def __init__(self, max_speed, mileage):\n",
+    "        self.max_speed = max_speed\n",
+    "        self.mileage = mileage\n",
     "\n",
+    "# Example instantiation\n",
+    "# Create an instance of Vehicle\n",
+    "class modelX (Vehicle):\n",
+    "    max_speed = 70\n",
+    "    mileage = 100\n",
     "# Print attributes\n",
     "print(modelX.max_speed, modelX.mileage)  # Expected output: (value of max_speed, value of mileage)"
    ]
@@ -56,7 +70,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 10,
    "metadata": {},
    "outputs": [
     {
@@ -87,7 +101,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [
     {
@@ -118,14 +132,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 23,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Base fare\n"
+      "Base fare with extra charge: 10\n"
      ]
     }
    ],
@@ -136,11 +150,15 @@
     "        return \"Base fare\"\n",
     "\n",
     "class Bus(Vehicle):\n",
-    "    # Hint: Override fare method to include extra charges\n",
-    "    pass\n",
+    "    def __init__(self, bus_fare):\n",
+    "        self.bus_fare = bus_fare\n",
     "\n",
-    "school_bus = Bus()\n",
-    "print(school_bus.fare())  # Expected output: \"Base fare with extra charge\""
+    "    def fare(self):\n",
+    "        return f\"{super().fare()} with extra charge: {self.bus_fare}\"\n",
+    "\n",
+    "school_bus = Bus(10)\n",
+    "print(school_bus.fare())  # Output: \"Base fare with extra charge: 10\"\n",
+    "# Output: \"Base fare with extra charge\"\n"
    ]
   },
   {
@@ -153,7 +171,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 24,
    "metadata": {},
    "outputs": [
     {
@@ -188,19 +206,18 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 30,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Total Bus fare is: 5000\n"
+      "Total Bus fare is: 5500.0\n"
      ]
     }
    ],
    "source": [
-    "# Your code here\n",
     "class Vehicle:\n",
     "    def __init__(self, name, mileage, capacity):\n",
     "        self.name = name\n",
@@ -211,11 +228,14 @@
     "        return self.capacity * 100\n",
     "\n",
     "class Bus(Vehicle):\n",
-    "    # Hint: Override fare method to include maintenance charge\n",
-    "    pass\n",
+    "    def fare(self):\n",
+    "        base_fare = super().fare() #super().fare() gets the base fare (capacity * 100) from Vehicle\n",
+    "        maintenance_charge = 0.10 * base_fare # maintenannce charge is defined\n",
+    "        return base_fare + maintenance_charge # base fare calculated\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)"
+    "print(\"Total Bus fare is:\", school_bus.fare()) \n",
+    "# Expected output: Total Bus fare is: (calculated amount)"
    ]
   },
   {
@@ -228,7 +248,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 31,
    "metadata": {},
    "outputs": [
     {
@@ -255,7 +275,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 32,
    "metadata": {},
    "outputs": [
     {