[求助]请教一道prep数学DS题，万分感谢！！

gummycandy

一道DS题

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 1000 video cameras in 1993, how many video cameras did the manufacturer produced in 1995?

(1)  xy =20

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

答案是选的B，
            我怎么觉得应该选C呢？

gummycandy

以下是引用时间造物在2009/7/25 22:23:00的发言：

1993 = 1000 video cameras
1994 = 1000*(1+x/100)
1995 = 1000*(1+x/100)(1+y/100) 

乘开得到： 1995 = 1000*(1+x/100+y/100+xy/10,000)

下面就不要继续写了吧，2条件正好满足！

谢谢啦， 我明白喽

我把X和Y 直接带进去算了，忘记除以100了