Update Exercise 3 - Article.txt

Part 1/7. Classes and objects/Exercises/Exercise 3 - Article.txt

@@ -16,4 +16,4 @@ The class should contain the following member functions:
 
 Create an object of type Article in the main program. 
 Enter the data and then output it again. 
-The user should then be able to enter a quantity, which will determine the total price.
+The user should then be able to enter a quantity, which will determine the total price.
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