using System;
public class Program
{
public static void Main()
double cc = 0.068627450980392163;
Console.WriteLine(cc);
double aa = Math.Round(cc, 4); // aa=0.0686
Console.WriteLine(aa);
double bb = Math.Round(cc, 4) * 100; // bb=6.8599999999999994
Console.WriteLine(bb);
}