Question: Assume that we change the CreditCard class (see Code Fragment 1.5) so that instance variable balance has private visibility, but a new protected method is

Assume that we change the CreditCard class (see Code Fragment 1.5) so that instance variable balance has private visibility, but a new protected method is added, with signature setBalance(newBalance). Show how to properly implement the method PredatoryCreditCard.processMonth( ) in this setting.

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