A good answer might be:

All video tapes will have a rental price, so the fixes should be made to the parent class VideoTape. If a new member varible rent is added to the base class, and if its constructor and its show() method are modified, the two child classes will inherit these changes. Fixing the parent class fixes all of its children.

End of the Chapter

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Single Inheritance.
Is-a Relationship
Class hierarchies
The super Reference in a constructor.
Method Overriding
The super Reference in a child method.

The next chapter will discuss further aspects of inheritance.

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