Pastry Shop

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String type = scanner.nextLine();
        double quantity = Double.parseDouble(scanner.nextLine()),
                date = Double.parseDouble(scanner.nextLine()),
                price;
        if (date <= 15) {
            if (type.equals("Cake")) {
                price = 24.00;
            } else if (type.equals("Souffle")) {
                price = 6.66;
            } else {
                price = 12.60;
            }
        } else {
            if (type.equals("Cake")) {
                price = 28.70;
            } else if (type.equals("Souffle")) {
                price = 9.80;
            } else {
                price = 16.98;
            }
        }

        double sum = price * quantity;

        if (date <= 22) {
            if (sum >= 100 && sum <= 200) {
                sum -= sum * 0.15;
            } else if (sum > 200) {
                sum -= sum * 0.25;
            }
        }

        if (date <= 15) {
            sum -= sum * 0.10;
        }

        System.out.printf("%.2f\n", sum);
    }
}

Решение с тернарен оператор:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String type = scanner.nextLine();
        double quantity = Double.parseDouble(scanner.nextLine()),
                date = Double.parseDouble(scanner.nextLine()),
                sum = (date <= 15 ? (type.equals("Cake") ? 24.00 : type.equals("Souffle") ? 6.66 : 12.60) :
                        (type.equals("Cake") ? 28.70 : type.equals("Souffle") ? 9.80 : 16.98)) * quantity;

        sum *= (date <= 22 ? (sum > 200 ? 0.75 : sum >= 100 ? 0.85 : 1) : 1) * (date <= 15 ? 0.90 : 1);

        System.out.printf("%.2f\n", sum);
    }
}