由后面名词的性质决定。

后面是复数名词，谓语动词用复数。后面是不可数名词，谓语动词用单三形式 30 percent of reptiles, birds, and fish are currently threatened with extinction. 目前，30%的爬行动物、鸟类和鱼类面临灭绝的危险。 来自柯林斯例句A 10 to 15 percent deviation is considered acceptable. 10%至15%的离差是可以接受的。 来自柯林斯例句