def decimal_to_percent(value, decimal_place=2):
    """
    Format a decimal to percentage with two decimal
    :param value: the value to be formatted
    :param decimal_place default decimal place, default to 2
    :return: a string in percentage format, 20.50% etc
    """
    format_str = '{:.' + str(2) + '%}'
    return format_str.format(value)