using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        string[] arr = new[]

        {

            "0.35","0.65","0.65"

        };

        var a = arr.Select(b => double.Parse(b)).Average() * 100;

        //Console.WriteLine(arr.Average() * 100);

        Console.WriteLine($"{a}");

        // Console.WriteLine(double.Parse(".35"));

        var c = arr.Select(b => decimal.Parse(b)).Average() * 100;

        Console.WriteLine($"{c}");

    }

}