A retail store has a preferred customer plan where customers can earn discounts on all their purchases.

A retail store has a preferred customer plan where customers can earn discounts

on all their purchases. The amount of a customer's discount is determined

by the amount of the customer's cumulative purchases in the store, as follows:

When a preferred customer spends $500, they get a 5% discount on all

future purchases.

When a preferred customer spends $1,000, they get a 6% discount on all

future purchases.

When a preferred customer spends $1,5000, they get a 7% discount on all

future purchases.

When a preferred customer spends $2,000, they get a 10% discount on all

future purchases.

Design a class named PreferredCustomer, which inherits from the Customer class

you created in Exercise 7. The preferredCustomer class should have int fields

for the amount of the customer's purchases and the customer's discount level. 

"Write a constructor that initializes these fields as well as accessor and

mutator methods. 

Desmonstrate the class in a program that prompts the user to input the

customer's name, address, phone number, customer number, whether they want to

recieve mail, and the amount they've spent, and then uses that information

to (create a) PreferredCustomer object and print its information. (Use string

formatting to print the amount spent.)

"Create all of the classes in the same file by not delcaring any of them public.