diff --git a/accounting/api/account.py b/accounting/api/account.py
index e843e61..e6ba6ed 100644
--- a/accounting/api/account.py
+++ b/accounting/api/account.py
@@ -5,7 +5,7 @@
 from accounting.schemas import AccountOut, FourOFourOut, GeneralLedgerOut
 from typing import List
 from django.db.models import Sum, Avg
-from rest_framework import status
+from http import HTTPStatus
 
 from restauth.authorization import AuthBearer
 
@@ -14,7 +14,7 @@
 
 @account_router.get("/get_all", response=List[AccountOut])
 def get_all(request):
-    return status.HTTP_200_OK, Account.objects.order_by('full_code')
+    return HTTPStatus.OK, Account.objects.order_by('full_code')
 
 
 @account_router.get('/get_one/{account_id}/', response={
@@ -34,33 +34,38 @@ def get_account_types(request):
     return {t[0]: t[1] for t in AccountTypeChoices.choices}
 
 
+
+
 @account_router.get('/account-balance/{account_id}', response=GeneralLedgerOut)
 def get_account_balance(request, account_id: int):
-    account = get_object_or_404(Account, id=account_id)
+    account = Account.objects.get(id=account_id)
+    children_accounts = account.children.all()
+    account_balance = account.balance()
+    children_balances=[]
+    balances=[]
 
-    balance = account.balance()
+    for a in children_accounts:
+        balance = a.balance()
+        children_balances.append(list(balance))
 
-    journal_entries = account.journal_entries.all()
+    for a in children_balances:
+        for i in a:
+            balances.append(i)
 
-    return 200, {'account': account.name, 'balance': list(balance), 'jes': list(journal_entries)}
+    for a in list(account_balance):
+        balances.append(a)
 
+    if account.parent == None:
+        final_balance= Balance(balances)
+    else:
+        final_balance=list(children_balances)+list(account_balance)
 
-@account_router.get('/account-balances/', response=List[GeneralLedgerOut])
-def get_account_balances(request):
-    accounts = Account.objects.all()
-    result = []
-    for a in accounts:
-        result.append({
-            'account': a.name, 'balance': list(a.balance())
-        })
+    return HTTPStatus.OK, {'account': account.name, 'balance':final_balance}
 
-    return status.HTTP_200_OK, result
 
 
+def Balance(balances):
 
-
-class Balance:
-    def __init__(self, balances):
         balance1 = balances[0]
         balance2 = balances[1]
 
@@ -71,17 +76,11 @@ def __init__(self, balances):
             balanceIQD = balance1['sum']
             balanceUSD = balance2['sum']
 
-        self.balanceUSD = balanceUSD
-        self.balanceIQD = balanceIQD
-
-    def __add__(self, other):
-        self.balanceIQD += other.balanceIQD
-        self.balanceUSD += other.balanceUSD
         return [{
             'currency': 'USD',
-            'sum': self.balanceUSD
+            'sum': balanceUSD
         }, {
             'currency': 'IQD',
-            'sum': self.balanceIQD
+            'sum': balanceIQD
         }]
 
diff --git a/accounting/api/task4.py b/accounting/api/task4.py
new file mode 100644
index 0000000..f2cb2eb
--- /dev/null
+++ b/accounting/api/task4.py
@@ -0,0 +1,59 @@
+class Balance:
+    def __init__(self, balances):
+        balance1 = balances[0]
+        balance2 = balances[1]
+
+        if balance1['currency'] == 'USD':
+            balanceUSD = balance1['sum']
+            balanceIQD = balance2['sum']
+        else:
+            balanceIQD = balance1['sum']
+            balanceUSD = balance2['sum']
+
+        self.balanceUSD = balanceUSD
+        self.balanceIQD = balanceIQD
+
+    def __add__(self, other):
+        self.balanceIQD += other.balanceIQD
+        self.balanceUSD += other.balanceUSD
+        return [{
+            'currency': 'USD',
+            'sum': self.balanceUSD
+        }, {
+            'currency': 'IQD',
+            'sum': self.balanceIQD
+        }]
+
+
+#Task-4
+    def check1(self , other):
+        if self.balanceUSD > other.balanceUSD:
+            result_OF_USD = True
+        else:
+            result_OF_USD = False
+
+        if self.balanceIQD > other.balanceIQD:
+            result_OF_IQD = True
+        else:
+            result_OF_IQD = False
+
+        return {result_OF_USD , result_OF_IQD}
+
+    def check2(self , other):
+        if self.balanceUSD < other.balanceUSD:
+            result_OF_USD = True
+        else:
+            result_OF_USD = False
+
+        if self.balanceIQD < other.balanceIQD:
+            result_OF_IQD = True
+        else:
+            result_OF_IQD = False
+
+        return {result_OF_USD , result_OF_IQD}
+
+    def is_the_sklolo_zero(self):
+        if self.balanceIQD  == 0 and self.balanceUSD == 0:
+            return True
+        else:
+            return False
diff --git a/accounting/models.py b/accounting/models.py
index a7d49b7..09e9574 100644
--- a/accounting/models.py
+++ b/accounting/models.py
@@ -49,7 +49,7 @@ class CurrencyChoices(models.TextChoices):
 
 
 class Account(models.Model):
-    parent = models.ForeignKey('self', null=True, blank=True, on_delete=models.SET_NULL)
+    parent = models.ForeignKey('self', null=True, blank=True, on_delete=models.SET_NULL , related_name='children')
     type = models.CharField(max_length=255, choices=AccountTypeChoices.choices)
     name = models.CharField(max_length=255)
     code = models.CharField(max_length=20, null=True, blank=True)