Add Bags

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double priceBagOver20kg = Double.parseDouble(scanner.nextLine()),
                bagWeight = Double.parseDouble(scanner.nextLine());
        int dayBefore = Integer.parseInt(scanner.nextLine()),
                bagCount = Integer.parseInt(scanner.nextLine());

        if (bagWeight < 10) {
            priceBagOver20kg /= 5;
        } else if (bagWeight <= 20) {
            priceBagOver20kg /= 2;
        }

        if (dayBefore < 7) {
            priceBagOver20kg *= 1.40;
        } else if (dayBefore <= 30) {
            priceBagOver20kg *= 1.15;
        } else {
            priceBagOver20kg *= 1.10;
        }

        double totalPrice = priceBagOver20kg * bagCount;

        System.out.printf("The total price of bags is: %.2f lv.\n", totalPrice);
    }
}

ИЛИ:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double priceBagOver20kg = Double.parseDouble(scanner.nextLine()),
                bagWeight = Double.parseDouble(scanner.nextLine());
        int dayBefore = Integer.parseInt(scanner.nextLine()),
                bagCount = Integer.parseInt(scanner.nextLine());

        double totalPrice =
                priceBagOver20kg / (bagWeight < 10 ? 5 : bagWeight <= 20 ? 2 : 1)
                        * (dayBefore < 7 ? 1.40 : dayBefore <= 30 ? 1.15 : 1.10) * bagCount;

        System.out.printf("The total price of bags is: %.2f lv.\n", totalPrice);
    }
}