diff --git a/lab-python-lambda-map-reduce-filter.ipynb b/lab-python-lambda-map-reduce-filter.ipynb
index 96c9781..60dcfef 100644
--- a/lab-python-lambda-map-reduce-filter.ipynb
+++ b/lab-python-lambda-map-reduce-filter.ipynb
@@ -94,12 +94,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "id": "0781335d-39cf-403d-b86a-ca908a09fe55",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[(-1200, 'debit'), (-100, 'debit'), (-250, 'debit'), (-300, 'debit'), (-850, 'debit')]\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "transactions = [\n",
+    "    (-1200, 'debit'),\n",
+    "    (2500, 'credit'),\n",
+    "    (-100, 'debit'),\n",
+    "    (850, 'credit'),\n",
+    "    (-250, 'debit'),\n",
+    "    (1500, 'credit'),\n",
+    "    (-300, 'debit'),\n",
+    "    (5000, 'credit'),\n",
+    "    (-850, 'debit'),\n",
+    "    (1000, 'credit')\n",
+    "]\n",
+    "\n",
+    "debits = list(filter(lambda transaction: transaction[1] == 'debit', transactions))\n",
+    "\n",
+    "print(debits)"
    ]
   },
   {
@@ -124,12 +147,28 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "id": "25073469-7258-4fc6-b0a0-ef8ea57688fe",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[(-100, 'debit'), (-250, 'debit'), (-300, 'debit'), (-850, 'debit'), (-1200, 'debit')]\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "sort_descending = lambda transaction: transaction[0]\n",
+    "\n",
+    "debits_descending = sorted(\n",
+    "    debits,\n",
+    "    key=sort_descending,\n",
+    "    reverse=True\n",
+    ")\n",
+    "\n",
+    "print(debits_descending)"
    ]
   },
   {
@@ -158,23 +197,31 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "id": "e1de9d03-f029-4e2e-9733-ae92e3de7527",
    "metadata": {},
-   "outputs": [],
-   "source": [
-    "# create list of bank account balances\n",
-    "balances = [100, 50, -25, 1000, -10]"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "2f253b7e-5300-4819-b38f-9fc090554f51",
-   "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[105.0, 52.5, -26.25, 1050.0, -10.5]\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# Original bank account balances\n",
+    "balances = [100, 50, -25, 1000, -10]\n",
+    "\n",
+    "# Interest rate of 5%\n",
+    "interest_rate = 0.05\n",
+    "\n",
+    "# Apply one year of interest to every balance\n",
+    "new_balances = list(\n",
+    "    map(lambda balance: balance * (1 + interest_rate), balances)\n",
+    ")\n",
+    "\n",
+    "print(new_balances)"
    ]
   },
   {
@@ -209,12 +256,36 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "id": "0906a9b0-d567-4786-96f2-5755611b885e",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[{'balance': 1020.0, 'interest_rate': 0.02}, {'balance': 2020.0, 'interest_rate': 0.01}, {'balance': 515.0, 'interest_rate': 0.03}]\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code goes here\n"
+    "accounts = [\n",
+    "    {'balance': 1000, 'interest_rate': 0.02},\n",
+    "    {'balance': 2000, 'interest_rate': 0.01},\n",
+    "    {'balance': 500, 'interest_rate': 0.03},\n",
+    "]\n",
+    "\n",
+    "updated_accounts = list(\n",
+    "    map(\n",
+    "        lambda account: {\n",
+    "            'balance': account['balance'] * (1 + account['interest_rate']),\n",
+    "            'interest_rate': account['interest_rate']\n",
+    "        },\n",
+    "        accounts\n",
+    "    )\n",
+    ")\n",
+    "\n",
+    "print(updated_accounts)\n"
    ]
   },
   {
@@ -243,14 +314,39 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "id": "6284dbd3-e117-411e-8087-352be6deaed4",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Negative balances: [-26.25, -10.5]\n",
+      "Total negative balance: -36.75\n"
+     ]
+    }
+   ],
    "source": [
     "from functools import reduce\n",
     "\n",
-    "# your code goes here"
+    "# Balances after adding 5% interest\n",
+    "new_balances = [105.0, 52.5, -26.25, 1050.0, -10.5]\n",
+    "\n",
+    "# Keep only negative balances\n",
+    "negative_balances = list(\n",
+    "    filter(lambda balance: balance < 0, new_balances)\n",
+    ")\n",
+    "\n",
+    "# Add all negative balances together\n",
+    "total_negative_balance = reduce(\n",
+    "    lambda total, balance: total + balance,\n",
+    "    negative_balances,\n",
+    "    0\n",
+    ")\n",
+    "\n",
+    "print(\"Negative balances:\", negative_balances)\n",
+    "print(\"Total negative balance:\", total_negative_balance)"
    ]
   },
   {
@@ -273,10 +369,18 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "id": "da2264b5-298e-4b45-99df-852b94e90d15",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[650, 1600, 275]\n"
+     ]
+    }
+   ],
    "source": [
     "accounts = [\n",
     "    {'balance': 1000, 'withdrawals': [100, 50, 200]},\n",
@@ -284,15 +388,22 @@
     "    {'balance': 500, 'withdrawals': [50, 100, 75]},\n",
     "]\n",
     "\n",
-    "# your code goes here\n"
+    "def calculate_balance(account):\n",
+    "    total_withdrawals = sum(account['withdrawals'])\n",
+    "    remaining_balance = account['balance'] - total_withdrawals\n",
+    "    return remaining_balance\n",
+    "\n",
+    "remaining_balances = list(map(calculate_balance, accounts))\n",
+    "\n",
+    "print(remaining_balances)"
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python [conda env:anaconda3] *",
    "language": "python",
-   "name": "python3"
+   "name": "conda-env-anaconda3-py"
   },
   "language_info": {
    "codemirror_mode": {
@@ -304,7 +415,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.9"
   }
  },
  "nbformat": 4,