Software Sales

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        double packageRetail = 99;
        double quantity;
        double discount;
        double purchase;

        System.out.println("How many packages you want to buy?");
        quantity = scanner.nextDouble();

        if (quantity >= 100)
        {
            discount = 0.5;
            System.out.println("Discount: " + discount + "%");
            purchase = (packageRetail * quantity) * discount;
            System.out.println("Total amount of purchase after discount: " + purchase);
        }
        else if (quantity >= 50 && quantity <= 99)
        {
            discount = 0.4;
            System.out.println("Discount: " + discount + "%");
            purchase = (packageRetail * quantity) * discount;
            System.out.println("Total amount of purchase after discount: $" + purchase);
        }
        else if (quantity >= 20 && quantity <= 49)
        {
            discount = 0.3;
            System.out.println("Discount: " + discount + "%");
            purchase = (packageRetail * quantity) * discount;
            System.out.println("Total amount of purchase after discount: $" + purchase);
        }
        else if (quantity >= 10 && quantity <= 19)
        {
            discount = 0.2;
            System.out.println("Discount: " + discount + "%");
            purchase = (packageRetail * quantity) * discount;
            System.out.println("Total amount of purchase after discount: $" + purchase);
        }
        else
        {
            System.out.println("No discount");
            purchase = packageRetail * quantity;
            System.out.println("Total amount of purchase: $" + purchase);
        }

    }
}