7. Person and Customer Classes Design a class named Person with fields for holding a persons name, address, and telephone number. Write one or more constructors and the appropriate mutator and accessor methods for the classs fields. Next, design a class named Customer , which inherits from the Person class. The Customer class should have a field for a customer number and a boolean field indicating whether the customer wishes to be on a mailing list. Write one or more constructors and the appropriate mutator and accessor methods for the classs fields. Demonstrate an object of the Customer class in a simple program.

8. PreferredCustomer Class A retail store has a preferred customer plan where customers can earn discounts on all their purchases. The amount of a customers discount is determined by the amount of the customers cumulative purchases in the store, as follows: ? When a preferred customer spends $500, he or she gets a 5% discount on all future purchases. ? When a preferred customer spends $1,000, he or she gets a 6% discount on all future purchases. ? When a preferred customer spends $1,500, he or she gets a 7% discount on all future purchases. ? When a preferred customer spends $2,000 or more, he or she gets a 10% discount on all future purchases. Design a class named PreferredCustomer , which inherits from the Customer class you created in Programming Challenge 7. The PreferredCustomer class should have fields for the amount of the customers purchases and the customers discount level. Write one or more constructors and the appropriate mutator and accessor methods for the classs fields. Demonstrate the class in a simple program.