diff --git a/Chapter_09/9-04_number_served.py b/Chapter_09/9-04_number_served.py
new file mode 100644
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+++ b/Chapter_09/9-04_number_served.py
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+# Exercise 9-4 Number Served 
+# Learning Objective: Directly modify an instance of a class. 
+
+class Restaurant: 
+    def __init__(self, name, cuisine_type):
+        """Initialize variables name and cuisine_type, define functions to describe and to open restaurant..."""
+
+        self.name = name
+        self.cuisine_type = cuisine_type
+        self.number_served = 0
+
+    def describe_restaurant(self):
+        """Describe the restaurant"""
+        print(f"The restaurant's name is {self.name} and the cuisine served here is {self.cuisine_type}")
+
+    def open_restaurant(self):
+        """Simulate it being opened"""
+        print(f"{self.name} is now open for business.")
+    
+    def get_number_served(self):
+        """Retrieve current number of customers that have been served."""
+        print(f'{self.number_served} customers have been served at {self.name} so far.')
+
+    def set_number_served(self, num):
+        """ Enable manual modification to number of customers served"""
+        self.number_served = num
+    
+    def increment_number_served(self):
+        """Incremental change to number of customers served"""
+        self.number_served += 1
+
+restaurant = Restaurant("Henry's Hangry Hen House", "American Breakfast")
+restaurant.get_number_served()
+restaurant.open_restaurant()
+#restaurant.set_number_served(80)
+#restaurant.number_served += 50
+for i in range(4) :
+    restaurant.increment_number_served()
+    restaurant.get_number_served()
+