def mm2cin(arg):
    """
    Convert millimeters to 1/100 in.

    Arguments:
        arg: Number or sequence of numbers.

    Returns:
        Converted number or sequence.
    """
    if not type(arg) in [list, tuple]:
        return float(arg) * 100.0 / 25.4
    return [float(j) * 100.0 / 25.4 for j in arg]