[讨论]关于数据充分性问题请教：

   各位大侠，小女有一个OG上数据充分性问题请教，在11th OG数学单册的149页，10题：

    OF the 230 single-family homes built in CityX last year, how many were occupied at the end of the year?

    (1) of all single-familiy homes in City X,90% were occupied at the end of last year

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

    答案选（E），我百思不得其解，请各位大侠赐教！先谢了！

     我已经搞清楚了这题，谢谢！