請教一題OG MATH

In a survey of reatilers, what percent had purchased computers for business purposes?

(1)85 percent of the retailers surveyed who owned their own store had purchased computers for business purposes.

(2)40 percent of the retailers surveryed owned their own store

答案是:both statements together are still not sufficient

可是我覺得(1)有把解釋說出來,請問有大大能跟我說明一下嗎?