diff --git a/lab-python-lambda-map-reduce-filter.ipynb b/lab-python-lambda-map-reduce-filter.ipynb
index 96c9781..22d03c5 100644
--- a/lab-python-lambda-map-reduce-filter.ipynb
+++ b/lab-python-lambda-map-reduce-filter.ipynb
@@ -66,7 +66,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "id": "08463071-9351-4d49-8d29-4fcb817fb177",
    "metadata": {},
    "outputs": [],
@@ -94,12 +94,30 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "id": "0781335d-39cf-403d-b86a-ca908a09fe55",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[(-1200, 'debit'),\n",
+       " (-100, 'debit'),\n",
+       " (-250, 'debit'),\n",
+       " (-300, 'debit'),\n",
+       " (-850, 'debit')]"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "credits = list(filter(lambda x: x[1]== \"credit\", transactions))\n",
+    "debit =list(filter(lambda x: x[1]== \"debit\", transactions))\n",
+    "debit"
    ]
   },
   {
@@ -124,12 +142,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 16,
    "id": "25073469-7258-4fc6-b0a0-ef8ea57688fe",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[(-1200, 'debit'),\n",
+       " (-850, 'debit'),\n",
+       " (-300, 'debit'),\n",
+       " (-250, 'debit'),\n",
+       " (-100, 'debit')]"
+      ]
+     },
+     "execution_count": 16,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "sort_descending = lambda t1: t1[0]\n",
+    "\n",
+    "sorted_debit = sorted(debit, key=sort_descending)\n",
+    "sorted_debit\n",
+    "# sort_descending = lambda t1, t2: t1[0] > t2[0]\n",
+    "\n",
+    "# sorted_debit = sorted(debit, key=sort_descending )"
    ]
   },
   {
@@ -158,7 +198,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 17,
    "id": "e1de9d03-f029-4e2e-9733-ae92e3de7527",
    "metadata": {},
    "outputs": [],
@@ -169,12 +209,29 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 30,
    "id": "2f253b7e-5300-4819-b38f-9fc090554f51",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[105.0, 52.5, -26.25, 1050.0, -10.5]"
+      ]
+     },
+     "execution_count": 30,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "def calc_interest(balance):\n",
+    "    balance += balance*0.05\n",
+    "    return balance\n",
+    "\n",
+    "balances_with_interest = list(map(calc_interest, balances))\n",
+    "balances_with_interest"
    ]
   },
   {
@@ -195,7 +252,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 20,
    "id": "69e24c3b-385e-44d6-a8ed-705a3f58e696",
    "metadata": {},
    "outputs": [],
@@ -209,12 +266,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 24,
    "id": "0906a9b0-d567-4786-96f2-5755611b885e",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[1020.0, 2020.0, 515.0]"
+      ]
+     },
+     "execution_count": 24,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "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",
+    "# your code goes here\n",
+    "def calc_interest(balance, interest_rate):\n",
+    "    balance += balance * interest_rate\n",
+    "    return balance\n",
+    "\n",
+    "new_balances = map(lambda x: calc_interest(x[\"balance\"], x[\"interest_rate\"]), accounts)\n",
+    "list(new_balances)"
    ]
   },
   {
@@ -243,14 +322,39 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 37,
    "id": "6284dbd3-e117-411e-8087-352be6deaed4",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[-26.25, -10.5]\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "-36.75"
+      ]
+     },
+     "execution_count": 37,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "from functools import reduce\n",
     "\n",
-    "# your code goes here"
+    "# your code goes here\n",
+    "print(list(filter(lambda x: x <0, balances_with_interest)))\n",
+    "\n",
+    "negative_balances = reduce(lambda x,y: x + y,\n",
+    "                        filter(lambda x: x <0, balances_with_interest)\n",
+    ")\n",
+    "\n",
+    "negative_balances"
    ]
   },
   {
@@ -273,10 +377,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 40,
    "id": "da2264b5-298e-4b45-99df-852b94e90d15",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[650, 1600, 275]"
+      ]
+     },
+     "execution_count": 40,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "accounts = [\n",
     "    {'balance': 1000, 'withdrawals': [100, 50, 200]},\n",
@@ -284,13 +399,18 @@
     "    {'balance': 500, 'withdrawals': [50, 100, 75]},\n",
     "]\n",
     "\n",
-    "# your code goes here\n"
+    "# your code goes here\n",
+    "def calculate_balance(balance, widthdrawls):\n",
+    "    return balance - sum(widthdrawls)\n",
+    "\n",
+    "account_balances = map(lambda x: calculate_balance(x[\"balance\"], x[\"withdrawals\"]), accounts)\n",
+    "list(account_balances)"
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },