Use the files given to you under final exam module.

A retail store has a rewards customer plan where customers may 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.

Design a class named RewardCustomer, which is derived from the CustomerData class you created.

The RewardCustomer class should have the following member variables:

purchasesAmount $($a double$)$

The purchasesAmount variable holds the total of a customer$$s purchases to date.

couponSubscription $($a bool$)$

The couponSubscription variable should be set to true if the customer has signed up for coupons.

Output should indicate $$Yes$$ or $$No$$ not $0$ or

Create a default constructor for RewardCustomer

Create appropriate accessors and mutators $($getters and setters$)$ for each class member.

Write appropriate member functions for this class and demonstrate it in a simple program. Demo all function on the main function.

Create RewardCustomer object to access all functions.

Input Validation: Do not accept negative values for any sales figures.