var a: integer; b, c, d, e: real;
begin
  d := 0;
  e := 0;
  for a := 1 to 10 do
  begin
    read(b, c);
    d := d + (b * c);
    e := e + b;
  end;
  writeln(d:0:2, ' ', (d / e):0:2);
end.