diff --git a/solutions/object_oriented_design/call_center/call_center.ipynb b/solutions/object_oriented_design/call_center/call_center.ipynb
index c540c6a6..83439fbb 100644
--- a/solutions/object_oriented_design/call_center/call_center.ipynb
+++ b/solutions/object_oriented_design/call_center/call_center.ipynb
@@ -69,9 +69,9 @@
     "\n",
     "class Rank(Enum):\n",
     "\n",
-    "    OPERATOR = 0\n",
-    "    SUPERVISOR = 1\n",
-    "    DIRECTOR = 2\n",
+    "    OPERATOR = 30\n",
+    "    SUPERVISOR = 20\n",
+    "    DIRECTOR = 10\n",
     "\n",
     "\n",
     "class Employee(metaclass=ABCMeta):\n",
diff --git a/solutions/object_oriented_design/call_center/call_center.py b/solutions/object_oriented_design/call_center/call_center.py
index 1d5e7bc6..1a295053 100644
--- a/solutions/object_oriented_design/call_center/call_center.py
+++ b/solutions/object_oriented_design/call_center/call_center.py
@@ -5,10 +5,9 @@ from enum import Enum
 
 class Rank(Enum):
 
-    OPERATOR = 0
-    SUPERVISOR = 1
-    DIRECTOR = 2
-
+    OPERATOR = 30
+    SUPERVISOR = 20
+    DIRECTOR = 10
 
 class Employee(metaclass=ABCMeta):