public static void Main()
Console.WriteLine("*** DIEM TRUNG BINH ***");
Console.Write("Input Attendant mark= ");
double Attendant = Convert.ToDouble(Console.ReadLine());
Console.Write("Input Practical mark= ");
double Practical = Convert.ToDouble(Console.ReadLine());
Console.Write("Input Final Exam= ");
double FinalExam = Convert.ToDouble(Console.ReadLine());
double Average = Attendant*0.2 + Practical*0.3 + FinalExam*0.5;
Console.WriteLine(" Average mark= {0}",Math.Round(Average, 1));