diff --git a/lab-python-oop.ipynb b/lab-python-oop.ipynb
index c13bc58..2f7d64b 100644
--- a/lab-python-oop.ipynb
+++ b/lab-python-oop.ipynb
@@ -56,21 +56,55 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 22,
    "id": "21625526-3fae-4c55-bab5-f91940070681",
    "metadata": {},
    "outputs": [],
    "source": [
     "# your code goes here\n",
-    "\n"
+    "class BankAccount:\n",
+    "    account_count = 0\n",
+    "    def __init__(self, balance=0):\n",
+    "        BankAccount.account_count += 1\n",
+    "        self.account_number = BankAccount.account_count\n",
+    "        self.balance = balance\n",
+    "    \n",
+    "    def deposit(self, amount):\n",
+    "        self.balance += amount\n",
+    "    \n",
+    "    def withdraw(self, amount):\n",
+    "        if amount <=self.balance:\n",
+    "            self.balance -= amount\n",
+    "        else:\n",
+    "            print(\"insufficient balance\")\n",
+    "\n",
+    "    def get_balance(self):\n",
+    "        return self.balance\n",
+    "\n",
+    "    def get_account_number(self):\n",
+    "        return self.account_number"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 23,
    "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",
+      "insufficient balance\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 +151,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 55,
    "id": "4f8848b5-05d3-4259-9e24-914537926778",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "class SavingsAccount(BankAccount):\n",
+    "    def __init__(self, balance=0, interest_rate = 0.01):\n",
+    "        super().__init__(balance)\n",
+    "        self.interest_rate = interest_rate\n",
+    "    \n",
+    "    def add_interest(self):\n",
+    "        self.balance *= 1 + self.interest_rate\n",
+    "    \n",
+    "    def get_interest_rate(self):\n",
+    "        return self.interest_rate"
    ]
   },
   {
@@ -151,12 +195,27 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 56,
    "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"
+    "# your code goes here\n",
+    "s_account = SavingsAccount(100, 0.02)\n",
+    "s_account.deposit(50)\n",
+    "s_account.withdraw(25)\n",
+    "s_account.add_interest()\n",
+    "print(f\"Current balance: {s_account.get_balance()}\")\n",
+    "print(f\"Interest rate: {s_account.get_interest_rate()}\")"
    ]
   },
   {
@@ -189,12 +248,41 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 57,
    "id": "3c883c6e-3cb8-4043-92d3-12409668a28e",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "class CheckingAccount(BankAccount):\n",
+    "    def __init__(self, balance = 0, transaction_fee = 1):\n",
+    "        super().__init__(balance)\n",
+    "        self.transaction_fee = transaction_fee\n",
+    "        self.transaction_count = 0\n",
+    "    \n",
+    "    def deduct_fees(self):\n",
+    "        fees = self.transaction_fee * self.transaction_count\n",
+    "        if fees <= self.balance:\n",
+    "            self.balance -= fees\n",
+    "            self.reset_transactions()\n",
+    "            print(f\"Transaction fees of {fees}$ have been deducted from your account balance.\")\n",
+    "        else:\n",
+    "            print(\"ERROR: Insuficient balance\")\n",
+    "\n",
+    "    def deposit(self, amount):\n",
+    "        self.transaction_count += 1\n",
+    "        super().deposit(amount)\n",
+    "\n",
+    "    def withdraw(self, amount):\n",
+    "        if amount <= self.balance:\n",
+    "            self.transaction_count += 1\n",
+    "        super().withdraw(amount)\n",
+    "    \n",
+    "    def reset_transactions(self):\n",
+    "        self.transaction_count = 0\n",
+    "\n",
+    "    def get_transaction_count(self):\n",
+    "        return self.transaction_count"
    ]
   },
   {
@@ -234,18 +322,42 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 59,
    "id": "faa5b148-c11b-4be0-b810-de8a7da81451",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Transaction fees of 4$ have been deducted from your account balance.\n",
+      "Current Balance: 546)\n",
+      "Transaction count: 0\n",
+      "Transaction fees of 4$ have been deducted from your account balance.\n",
+      "Current Balance: 667)\n",
+      "Transaction count: 0\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "c_account = CheckingAccount(500, 2)\n",
+    "c_account.deposit(100)\n",
+    "c_account.withdraw(50)\n",
+    "c_account.deduct_fees()\n",
+    "print(f\"Current Balance: {c_account.get_balance()})\")\n",
+    "print(f\"Transaction count: {c_account.get_transaction_count()}\")\n",
+    "c_account.deposit(200)\n",
+    "c_account.withdraw(75)\n",
+    "c_account.deduct_fees()\n",
+    "print(f\"Current Balance: {c_account.get_balance()})\")\n",
+    "print(f\"Transaction count: {c_account.get_transaction_count()}\")"
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -259,7 +371,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.11.12"
   }
  },
  "nbformat": 4,