Photo pictures C# Programming basics Exam 03 Sept

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Photo_Pictures
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = int.Parse(Console.ReadLine());
            string kind = Console.ReadLine();
            string order = Console.ReadLine();
            var price = 1.0;

            if (kind == "9X13")
            {
                price = num * 0.16;
                if (num >= 50)
                {
                    price -= price * 0.05;
                }
            }
            else if (kind == "10X15")
            {
                price = num * 0.16;
                if (num >= 80)
                {
                    price -= price * 0.03;
                }
            }
            else if (kind == "13X18")
            {
                price = num * 0.38;
                if (num >= 50 && num <= 100)
                {
                    price -= price * 0.03;
                }
                else if (num > 100)
                {
                    price -= price * 0.05;
                }
            }
            else if (kind == "20X30")
            {
                price = num * 2.90;
                if (num >= 10 && num <= 50)
                {
                    price -= price * 0.07;

                }
                else if (num > 50)
                {
                    price -= price * 0.09;
                }
            }
            switch (order)
            {
                case "online":
                    price -= price * 0.02;
                    Console.WriteLine($"{price:F2}BGN");
                    break;
                default:
                    Console.WriteLine($"{price:F2}BGN");
                    break;
            }
        }
    }
}