diff --git a/lab-python-lambda-map-reduce-filter.ipynb b/lab-python-lambda-map-reduce-filter.ipynb
index 96c9781..76c704a 100644
--- a/lab-python-lambda-map-reduce-filter.ipynb
+++ b/lab-python-lambda-map-reduce-filter.ipynb
@@ -99,7 +99,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "debits = list(filter(lambda x: x[1] == 'debit', transactions))\n",
+    "debits"
    ]
   },
   {
@@ -129,7 +130,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "sort_descending = sorted(debits, key=lambda x: x[1], reverse=True)\n",
+    "sort_descending"
    ]
   },
   {
@@ -174,7 +176,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "interest_rate = 0.05\n",
+    "balances_interest = list(map(lambda b: (b * interest_rate) + b, balances))\n",
+    "balances_interest"
    ]
   },
   {
@@ -214,7 +218,11 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here\n"
+    "balances_interest = list(map(\n",
+    "    lambda acc: acc['balance'] * (1 + acc['interest_rate']),\n",
+    "    accounts\n",
+    "))\n",
+    "balances_interest\n"
    ]
   },
   {
@@ -250,7 +258,13 @@
    "source": [
     "from functools import reduce\n",
     "\n",
-    "# your code goes here"
+    "interest_rate = 0.05\n",
+    "balances_interest = list(map(lambda b: (b * interest_rate) + b, balances))\n",
+    "\n",
+    "negative_balances = list(filter(lambda x: x < 0, balances_interest))\n",
+    "total_negative = reduce(lambda acc, x: acc + x, negative_balances, 0)\n",
+    "\n",
+    "total_negative"
    ]
   },
   {
@@ -284,7 +298,13 @@
     "    {'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",
+    "remaining_balances\n"
    ]
   }
  ],