04. Transport Price

using System;

namespace TransportPrice
{
    class Program
    {
        static void Main(string[] args)
        {
            int km = int.Parse(Console.ReadLine());
            string time = Console.ReadLine();
            double price = 0;

            if (km < 20)
            {
                if (time == "day")
                {
                    price = km * 0.79 + 0.7;
                }
                else
                {
                    price = km * 0.9 + 0.7;
                }
            }
            else if (km >= 100)
            {
                price = km * 0.06;
            }
            else
            {
                price = km * 0.09;
            }

            Console.WriteLine($"{price:F2}");
        }
    }
}

РЕШЕНИЕ С ТЕРНАРЕН ОПЕРАТОР:

using System;

namespace TransportPrice
{
    class Program
    {
        static void Main(string[] args)
        {
            int km = int.Parse(Console.ReadLine());
            string time = Console.ReadLine();

            double price = km < 20 ? km * (time == "day" ? 0.79 : 0.9) + 0.7 : km >= 100 ? km * 0.06 : km * 0.09;

            Console.WriteLine($"{price:F2}");
        }
    }
}