1. Using object oriented programming approach, program to calculate the purchase price for a retail store.
- Define a class Product1 (Product1.java)
o Four private data members: product number, product name, unit price, units sold
o Two overloaded constructors
o Get and set methods for each private data member
o A method to calculate and return the purchase price (unit price * units sold)
o toString() method
- (Store.java) client program that creates a Product1 object based on the user input, computes the purchase price, and outputs the sales information (include the item id, item name, unit price, units sold, and purchase price).