def conflict_annotation(expt, loc):
    """
    Returns conflict rate of an experiment as a string percentage. Only does
    this if the experiment is EPaxos, as MPaxos has no conflict rate.
    """
    if expt.is_epaxos():
        conflict_rate = '{}%'.format(round(expt.conflict_rate(loc)*100, 1))
        return conflict_rate

    return None