Roshan has prospered despite its stated refusal to bribe , a scruple that mr khoja hints is not shared by all his competitors .
尽管拒绝行贿,罗山也已经取得成功,库拉暗示,并不是所有竞争对手都坚持这一原则。
In afghanistan telephone ladies take an average of eight months to pay off the microloan required to buy their equipment and then earn $ 50-100 a month , says karim khoja , chief executive of roshan , the country 's largest operator .