请教GMATPREP上的题

insonbia13

a manufacture 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

why the answer is B, but not C?

insonbia13

many  thanks !!!!

falcons

设95年produce M个

则94年：M/(1+y%)

93年:[M/(1+y%)]/(1+x%)=1000

M=1000+10x+10y+xy/10

将x+y+ xy/100 = 9.2代入可得M=1000+10*9.2=1092