10 percent families or 10% families
family 做主语谓语动词的单复数取决于它的意思。如果把它看作一个整体，谓语用单数each后面加单数还是复数；看作是个体，谓语动词用复数。
His family is poor but is united.
His family were watching TV when I went to see him yesterday
10 percent families
谓语动词用单数
10 percent families
ten percent of families或ten hundredths of families和后面的谓语动词都用复数，因为family是可数名词
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