per cent
(US percent), / pə ˈsent; pɚ`sɛnt/ adj, adv in or for every hundred 每一百之中（的）
a fifty per cent (ie 50%) increase in price 价格上涨百分之五十（即50%）
working twenty per cent harder 再多使二分劲儿. per cent (US percent), n [C usu sing, but with sing or pl v 通常作单数，但可与单数或复数动词连用]
one part in every hundred; percentage 百分之一; 百分比
half a per cent, ie 0.5% 百分之零点五（即0.5%）
Over sixty per cent of families own/owns a television. 百分之六十以上的家庭已有电视机.
What per cent of the population read/reads books? 识字的人占人口的百分之几?