green OG上的问题

shayuamerica

Of the 230 single-family homes built in city X last year, how many were occupied at the end of the year?

(1) Of all single-family homes in city X, 90% were occupied at the end of last year.

(2)A total of 7200 single-family homes in City X were occupied at the end of last year.

答案是Ｅ但我怎么觉得是Ｄ，我不知道哪里理解错误了，请指教．

我认为１：２３０＊９０％就可以了啊！

shayuamerica

是不是说ＡＬＬ是未知的！不是２３０所以不知道比例不能推测其中的ＯＣＣＵＰＩＥＤ　的数字

２也是一样的问题啊？