def resize_ratio(width, height, ratio_width, ratio_height):
    """ resize_ratio(width, height, 
                     ratio_width, ratio_height) -> (width, height)

    resize with values 0..1.  Where 0. is 0% and 1.0 is 100%.

    >>> resize_ratio(100, 100, 0.5, 0.5)
    (50, 50)
    >>> resize_ratio(100, 100, 1.0, 1.0)
    (100, 100)
    >>> resize_ratio(100, 100, 2.0, 2.0)
    (200, 200)
    """
    return int(ratio_width * width), int(ratio_height * height)
