Prep 2-140 请教，谢谢~~

ruhudisbfks

140. 

A manufacturer produced x percent more video cameras in 1994 than in 1993 and y percent more video cameras in 1995 than in 1994.  If the manufacturer produced 1,000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995 ?

(1) xy=20

(2) x+y +xy/100=9.2

答案是B.

但是我怎么觉得光第二的条件算不出来呢？

式子应该是：1000(1+x) (1+y)=1000(1+xy+x+y)

请大家帮我看看吧，是不是我脑子锈住了？？

谢谢！！

summervivien

式子应该是：1000（1＋X/100)*(1+Y/100)

LZ错把X理解成最终的百分比了。

ruhudisbfks

哦，我明白了，真是太感谢了！~