“费率”用英语怎么说？

电话每分钟36便士（优惠费率）和48便士（高峰费率）。Calls cost 36p (cheap rate) and 48p (peak rate) per minute.很多优惠费率都带有限制条件。Many reduced fares are hedged around with restrictions.收费率是前3公里10元,之后再加一公里收1.6元.The rate is 10 yuan for the first three ...