Логистика % Logistics

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)

        {
            var times = int.Parse(Console.ReadLine());

            double vanSum = 0;
            double trackSum = 0;
            double trainSum = 0;
            double totalSum = 0;
            double tones = 0;

            double vanTones = 0;
            double trackTones = 0;
            double trainTones = 0;

            for (int i = 0; i < times; i++)
            {
                var num = double.Parse(Console.ReadLine());

                tones = tones + num;

                if (num <= 3)
                {
                    vanTones = vanTones + num;
                    vanSum = vanSum + (num * 200); // 200lv.  van
                }
                else if (num <= 11)
                {
                    trackTones = trackTones + num;
                    trackSum = trackSum + (num * 175); // 175lv.  track
                }
                else if (num >= 12)
                {
                    trainTones = trainTones + num;
                    trainSum = trainSum + (num * 120); // 120lv.  trein
                }
                else
                {
                    Console.WriteLine("Error!");
                }

                totalSum = vanSum + trackSum + trainSum;
            }

            var pricePerTon = totalSum / tones;

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

            var vanPercent = vanTones / tones * 100;     //   4 / 25 * 100 = %
            var trackPercent = trackTones / tones * 100;
            var trainPercent = trainTones / tones * 100;

            Console.WriteLine($"{vanPercent:f2}%");
            Console.WriteLine($"{trackPercent:f2}%");
            Console.WriteLine($"{trainPercent:f2}%");
        }
    }
}