Program Penjualan Tiket Menggunakan Aplikasi Delphi

program penjualan tiket menggunakan Delphi..
procedure TForm1.Button2Click(Sender: TObject);
begin
  Edit1.Text := '';
  Edit2.Text := '';
  Edit3.Text := '';
  Edit4.Text := '';
  Edit5.Text := '';
  Edit6.Text := '';
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
Close;
end;

procedure TForm1.Button1Click(Sender: TObject);
var K : String;
    Hrg,U,HT,HB,D,DR : Real;
begin
  K := Uppercase(Edit1.Text);
  U := StrToFloat(Edit2.Text);

  if K ='A' then
    Hrg:= 2000000
  else if K ='B' then
    Hrg:= 1500000
  else
    Hrg:= 1000000;

  if U <= 12 then
    D:= 50
  else if U <60 then
    D:= 0
  else
    D:= 25;

    DR := Hrg * D/100;
    HB := Hrg - DR;

  Edit3.Text := FloatToStr(Hrg);
  Edit4.Text := FloatToStr(D);
  Edit5.Text := FloatToStr(DR);
  Edit6.Text := FloatToStr(HB);

end;

end.
Semoga bermanfaat .. :)