As I see in the screenshot, I think this program is very simple, it just prints text to command line screen and gets input from user, and finally it calculates the cost of each customer's purchase and println the result on the screen, when the purchase is reach 3 , it asks customers whether they want to discout and prints out the result, and exit. By my experience, I can finish this program in less than 2 hours, but if your require is more complexity, let me know and I will finish it as soon as possible for you.