one and one-half percent是百分之几

one and one-half percent是百分之几 three-and-one-half percent是百分之几? one half of one percent是百分之几? 是one and half hours还是one and half hour? seven and a half percent是百分之多少? The W.H.O.says about two and one-half percent die half的用法是 one and a half years 还是one and a half year?half具体的用 一天半 的英文是one and a half days还是one and half days 那1.5 是one and 是one and a half hours还是one and a half hour 英语翻译是one and a half hours还是one and half an hours还是其他? 一个半小时 英语：是one and a half hour 还是 one and a half hours 是one and a half hour 还是 one and a half hours