diff --git a/lab-python-oop.ipynb b/lab-python-oop.ipynb
index c13bc58..b5256d5 100644
--- a/lab-python-oop.ipynb
+++ b/lab-python-oop.ipynb
@@ -56,21 +56,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 11,
    "id": "21625526-3fae-4c55-bab5-f91940070681",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here\n",
+    "class BankAccount:  \n",
+    "    account_counter = 0  # Class variable to keep track of account numbers\n",
+    "    \n",
+    "    def __init__(self, initial_balance):\n",
+    "        self.balance = initial_balance\n",
+    "        BankAccount.account_counter += 1  # Increment the counter for each new account\n",
+    "        self.account_number = BankAccount.account_counter  # Assign unique account number\n",
+    "    \n",
+    "    def get_balance(self):\n",
+    "        return self.balance\n",
+    "    \n",
+    "    def get_account_number(self):\n",
+    "        return self.account_number\n",
+    "    \n",
+    "    def deposit(self, amount):\n",
+    "        self.balance += amount\n",
+    "        return self.balance\n",
+    "    \n",
+    "    def withdraw(self, amount):\n",
+    "        if amount > self.balance:\n",
+    "            return \"insufficient balance\"\n",
+    "        self.balance -= amount\n",
+    "        return self.balance\n",
+    "\n",
     "\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 12,
    "id": "ee789466-d4cf-4dd8-b742-6863d42c3e5c",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Account 1 balance: 1000\n",
+      "Account 1 number: 1\n",
+      "Account 2 balance: 500\n",
+      "Account 2 number: 2\n",
+      "Account 1 balance after transactions: 1300\n",
+      "Account 2 balance after transactions: 500\n"
+     ]
+    }
+   ],
    "source": [
     "# Testing the BankAccount class\n",
     "# Creating two instances of the BankAccount class with initial balances of 1000 and 500\n",
@@ -117,12 +153,30 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 18,
    "id": "4f8848b5-05d3-4259-9e24-914537926778",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "\n",
+    "class SavingsAccount(BankAccount):\n",
+    "    def __init__(self, initial_balance, interest_rate=0.01):\n",
+    "        # Initialize the parent class (BankAccount)\n",
+    "        super().__init__(initial_balance)\n",
+    "        # Add the interest_rate attribute specific to SavingsAccount\n",
+    "        self.interest_rate = interest_rate\n",
+    "    \n",
+    "    def add_interest(self):\n",
+    "        # Add interest to the balance\n",
+    "        interest_earned = self.balance * self.interest_rate\n",
+    "        self.balance += interest_earned\n",
+    "        return self.balance\n",
+    "    \n",
+    "    def get_interest_rate(self):\n",
+    "        return self.interest_rate\n",
+    "\n",
+    "\n",
+    "    "
    ]
   },
   {
@@ -151,12 +205,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 22,
    "id": "bccc7f6d-d58c-4909-9314-aaf4afc1cd30",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Current balance: 127.5\n",
+      "Interest rate: 0.02\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# Create a SavingsAccount object with a balance of $100 and interest rate of 2%\n",
+    "savings = SavingsAccount(100, 0.02)\n",
+    "\n",
+    "# Deposit $50 into the savings account\n",
+    "savings.deposit(50)\n",
+    "\n",
+    "# Withdraw $25 from the savings account\n",
+    "savings.withdraw(25)\n",
+    "\n",
+    "# Add interest to the savings account (interest rate is already set to 0.02)\n",
+    "savings.add_interest()\n",
+    "\n",
+    "# Print the current balance and interest rate of the savings account\n",
+    "print(\"Current balance:\", savings.get_balance())  # Expected: 127.5\n",
+    "print(\"Interest rate:\", savings.get_interest_rate())  # Expected: 0.02"
    ]
   },
   {
@@ -189,12 +266,33 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 20,
    "id": "3c883c6e-3cb8-4043-92d3-12409668a28e",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "# Create a CheckingAccount class that inherits from the BankAccount class. The CheckingAccount class should have the following additional attributes and methods:\n",
+    "\n",
+    "# Attributes:\n",
+    "\n",
+    "# transaction_fee (the fee charged per transaction. By default is 1$)\n",
+    "# transaction_count (the number of transactions made in the current month)\n",
+    "class CheckingAccount(BankAccount):\n",
+    "    def __init__(self, initial_balance, transaction_fee=1):\n",
+    "        # Initialize the parent class (BankAccount)\n",
+    "        super().__init__(initial_balance)\n",
+    "        # Add the transaction_fee attribute specific to CheckingAccount\n",
+    "        self.transaction_fee = transaction_fee\n",
+    "        # Initialize the transaction_count attribute to 0\n",
+    "        self.transaction_count = 0\n",
+    "    def deduct_fee(self):\n",
+    "        self.balance -= self.transaction_fee\n",
+    "    \n",
+    "    def reset_transaction(self):\n",
+    "        self.transaction_count = 0\n",
+    "        \n",
+    "    def get_transaction_count(self):\n",
+    "        return self.transaction_count"
    ]
   },
   {
@@ -234,12 +332,52 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 26,
    "id": "faa5b148-c11b-4be0-b810-de8a7da81451",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Transaction fees of 2 have been deducted from your account balance.\n",
+      "Current balance: 546\n",
+      "Transaction count: 0\n",
+      "Transaction fees of 2 have been deducted from your account balance.\n",
+      "Current balance: 667\n",
+      "Transaction count: 0\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "checkAccount = CheckingAccount(500, 2)\n",
+    "\n",
+    "checkAccount.deduct_fee()\n",
+    "print(f'Transaction fees of {checkAccount.transaction_fee} have been deducted from your account balance.')\n",
+    "# Deposit 100 dollars into the account \n",
+    "checkAccount.deposit(100) \n",
+    "# Withdraw 50 dollars from the account\n",
+    "checkAccount.withdraw(50)\n",
+    "# Deduct the transaction fees from the account\n",
+    "checkAccount.deduct_fee()\n",
+    "# Reset the transaction count\n",
+    "checkAccount.reset_transaction()\n",
+    "# Get the current balance and transaction count\n",
+    "print(\"Current balance:\", checkAccount.get_balance())\n",
+    "print(\"Transaction count:\", checkAccount.get_transaction_count())\n",
+    "# Deposit 200 dollars into the account\n",
+    "checkAccount.deposit(200)\n",
+    "# Withdraw 75 dollars from the account\n",
+    "checkAccount.deduct_fee()\n",
+    "print(f'Transaction fees of {checkAccount.transaction_fee} have been deducted from your account balance.')\n",
+    "checkAccount.withdraw(75)\n",
+    "# Deduct the transaction fees from the account\n",
+    "checkAccount.deduct_fee()\n",
+    "# Reset the transaction count\n",
+    "checkAccount.reset_transaction()\n",
+    "# Get the current balance and transaction count\n",
+    "print(\"Current balance:\", checkAccount.get_balance())\n",
+    "print(\"Transaction count:\", checkAccount.get_transaction_count())\n"
    ]
   }
  ],
@@ -259,7 +397,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.11.9"
   }
  },
  "nbformat": 4,