public static void Main()
Console.Write("Enter score ");
var num = int.Parse(Console.ReadLine());
else if (num > 100 && num <1000)
{bonusScore = num * 0.20;}
{bonusScore = num * 0.10;}
Console.WriteLine("Bonus score:{0}", bonusScore);
Console.WriteLine("Total score:{0}" , num + bonusScore);