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?
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
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