using System;

using System.Linq;

using System.Collections.Generic;

​

internal record Note(

    string TeachingUnit, 

    string StudentName, 

    string StudentMatricule, 

    double Grade);

​

public class Program

{

    private static IEnumerable<Note> Notes = new []

    {

        new Note("UE09", "Boule Etbill", "P770039", 12),

        new Note("UE09", "Gaston Lagaffe", "Q730042", 8),

        new Note("UE09", "Benoit Brisfer", "Q590016", 16),

        new Note("UE36", "Boule Etbill", "P770039", 11.5),

        new Note("UE36", "Gaston Lagaffe", "Q730042", 7),

        new Note("UE36", "Benoit Brisfer", "Q590016", 17),

        new Note("UE25", "Boule Etbill", "P770039", 15),

        new Note("UE25", "Gaston Lagaffe", "Q730042", 12),

        new Note("UE25", "Benoit Brisfer", "Q590016", 16),

    };

    public static void Main()

    {

        IEnumerable<(string Name, double Percent)> ue09Notes = Notes

            .Where(n => n.TeachingUnit == "UE09")

            .Select(n => (n.StudentName, n.Grade/20.0*100));

        foreach(var note in ue09Notes) 

        {

            Console.WriteLine($"{note.Name} - {note.Percent}");

        }

    }

}

​