05. Game Of Intervals

using System;

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

            double result = 0;
            double num0To10 = 0;
            double num10To20 = 0;
            double num20To30 = 0;
            double num30To40 = 0;
            double num40To50 = 0;
            double numInvalid = 0;

            for (int i = 1; i <= num; i++)
            {
                double current = double.Parse(Console.ReadLine());

                if (current >= 0 && current < 10)
                {
                    result += current * 0.2;
                    num0To10++;
                }
                else if (current >= 10 && current < 20)
                {
                    result += current * 0.3;
                    num10To20++;
                }
                else if (current >= 20 && current < 30)
                {
                    result += current * 0.4;
                    num20To30++;
                }
                else if (current >= 30 && current < 40)
                {
                    result += 50;
                    num30To40++;
                }
                else if (current >= 40 && current <= 50)
                {
                    result += 100;
                    num40To50++;
                }
                else
                {
                    result /= 2;
                    numInvalid++;
                }
            }
            Console.WriteLine($"{ result:f2}");
            Console.WriteLine($"From 0 to 9: {num0To10 / num * 100:f2}%");
            Console.WriteLine($"From 10 to 19: { num10To20 / num * 100:f2}%");
           Console.WriteLine($"From 20 to 29: { num20To30 / num * 100:f2}%");
            Console.WriteLine($"From 30 to 39: { num30To40 / num * 100:f2}%");
            Console.WriteLine($"From 40 to 50: { num40To50 / num * 100:f2}%");
            Console.WriteLine($"Invalid numbers: { numInvalid / num * 100:f2}%");
        }
    }