diff --git a/lab-python-oop.ipynb b/lab-python-oop.ipynb
index c13bc58..1342496 100644
--- a/lab-python-oop.ipynb
+++ b/lab-python-oop.ipynb
@@ -62,15 +62,59 @@
    "outputs": [],
    "source": [
     "# your code goes here\n",
+    "\n",
+    "class BankAccount:\n",
+    "\n",
+    "    account_count = 0\n",
+    "    transaction_count = 0\n",
+    "\n",
+    "    def __init__(self, balance):\n",
+    "        self.balance = balance\n",
+    "        BankAccount.account_count +=1\n",
+    "        self.account_number = BankAccount.account_count\n",
+    "        BankAccount.transaction_count = 0\n",
+    "        self.transaction_count = BankAccount.transaction_count\n",
+    "\n",
+    "    def deposit(self, amount):\n",
+    "        self.balance += amount\n",
+    "        self.transaction_count =+ 1\n",
+    "    \n",
+    "    def withdraw(self, amount):\n",
+    "        if amount <= self.balance:\n",
+    "            self.balance -= amount\n",
+    "            self.transaction_count += 1\n",
+    "        else:\n",
+    "            print(\"Insufficient balance.\")\n",
+    "    \n",
+    "    def get_balance(self):\n",
+    "        if self.balance >= 0:\n",
+    "            return self.balance\n",
+    "    \n",
+    "    def get_account_number(self):\n",
+    "        return self.account_number\n",
     "\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 24,
    "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 +161,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 29,
    "id": "4f8848b5-05d3-4259-9e24-914537926778",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "\n",
+    "class SavingsAccount(BankAccount):\n",
+    "    def __init__(self, balance,interest_rate = 0.01):\n",
+    "        super().__init__(balance) \n",
+    "        self.interest_rate = interest_rate\n",
+    "\n",
+    "    def add_interest(self):\n",
+    "        self.balance += self.balance * self.interest_rate\n",
+    "\n",
+    "    def get_interest_rate(self):\n",
+    "        return self.interest_rate"
    ]
   },
   {
@@ -151,12 +206,29 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 30,
    "id": "bccc7f6d-d58c-4909-9314-aaf4afc1cd30",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Current balance: 127.5 and interest rate: 0.02\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "\n",
+    "# Testing the SavingsAccount class\n",
+    "# Creating a instance of the SavingsAccount class with initial balances of 100 and interest rate of 2%\n",
+    "saving_account = SavingsAccount(100, 0.02)\n",
+    "saving_account.deposit(50)\n",
+    "saving_account.withdraw(25)\n",
+    "saving_account.add_interest()\n",
+    "\n",
+    "print(f\"Current balance: {saving_account.balance} and interest rate: {saving_account.interest_rate}\")"
    ]
   },
   {
@@ -189,12 +261,31 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 35,
    "id": "3c883c6e-3cb8-4043-92d3-12409668a28e",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "\n",
+    "class CheckingAccount(BankAccount):\n",
+    "    def __init__(self, balance, transaction_fee = 1):\n",
+    "        super().__init__(balance) \n",
+    "        self.transaction_fee = transaction_fee\n",
+    "\n",
+    "    def deduct_fees(self):\n",
+    "        if self.transaction_fee * self.transaction_count < self.balance:\n",
+    "            self.balance-= self.transaction_fee * self.transaction_count\n",
+    "            print (f\"{self.transaction_fee * self.transaction_count} have been deducted in fees from the account\")\n",
+    "            self.reset_transactions() \n",
+    "        else:\n",
+    "            print(\"There is not sufficient funds in the account\")\n",
+    "    \n",
+    "    def reset_transactions(self):\n",
+    "        self.transaction_count = 0\n",
+    "        \n",
+    "    def get_transaction_count(self):\n",
+    "        return self.transaction_count"
    ]
   },
   {
@@ -234,12 +325,37 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 36,
    "id": "faa5b148-c11b-4be0-b810-de8a7da81451",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "4 have been deducted in fees from the account\n",
+      "Current balance: 546 and transaction count: 0\n",
+      "4 have been deducted in fees from the account\n",
+      "Current balance: 667 and transaction count: 0\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "\n",
+    "# Testing the CheckingAccount class\n",
+    "# Creating a instance of the CheckingAccount class with initial balances of 500 and transaction fee of 2\n",
+    "\n",
+    "checking_account = CheckingAccount(500, 2)\n",
+    "checking_account.deposit(100)\n",
+    "checking_account.withdraw(50)\n",
+    "checking_account.deduct_fees()\n",
+    "print(f\"Current balance: {checking_account.balance} and transaction count: {checking_account.transaction_count}\")\n",
+    "\n",
+    "checking_account.deposit(200)\n",
+    "checking_account.withdraw(75)\n",
+    "checking_account.deduct_fees()\n",
+    "print(f\"Current balance: {checking_account.balance} and transaction count: {checking_account.transaction_count}\")"
    ]
   }
  ],