Pastry Shop

using System;

namespace PastryShop
{
    class Program
    {
        static void Main(string[] args)
        {
            string type = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());
            int date = int.Parse(Console.ReadLine());
            double price = 0;

            if (date <= 15)
            {
                if (type == "Cake")
                {
                    price = 24.0;
                }
                else if (type == "Souffle")
                {
                    price = 6.66;
                }
                else if (type == "Baklava")
                {
                    price = 12.60;
                }
            }
            else if (date > 15)
            {
                if (type == "Cake")
                {
                    price = 28.7;
                }
                else if (type == "Souffle")
                {
                    price = 9.8;
                }
                else if (type == "Baklava")
                {
                    price = 16.98;
                }
            }
            double sum = quantity * price;

            if (date <= 22 && sum >= 100 && sum <= 200)
            {
                sum -= sum * 0.15;
            }
            else if (date <= 22 && sum > 200)
            {
                sum -= sum * 0.25;
            }
            if (date <= 15)
            {
                sum -= sum * 0.1;
            }
            Console.WriteLine($"{sum:f2}");
        }
    }
}

Решение с тернарен оператор:

using System;

namespace PastryShop
{
    class Program
    {
        static void Main(string[] args)
        {
            string product = Console.ReadLine();
            int volume = int.Parse(Console.ReadLine());
            int date = int.Parse(Console.ReadLine());

            double sum = (product == "Cake" ? (date > 15 ? 28.70 : 24)
                        : product == "Souffle" ? (date > 15 ? 9.80 : 6.66)
                        : product == "Baklava" ? (date > 15 ? 16.98 : 12.60) : 0) * volume;

            sum *= date <= 22 && sum >= 100 && sum <= 200 ? 0.85 : 1;
            sum *= date <= 22 && sum > 200 ? 0.75 : 1;
            sum *= date <= 15 ? 0.9 : 1;

            Console.WriteLine($"{sum:f2}");
        }
    }
}