→ qqopqqop:感激 09/02 19:15
※ 引述《qqopqqop (p )》之銘言：
: A certain company that sells only cars and trucks reported that
: revenues from car sales in 1997 were down 11 percent from 1996 and revenues
: from truck sales in 1997 were up 7 percent from 1996. If total revenues
: from car sales and truck sales in 1997 were up 1 percent from 1996, what is
: the ratio of revenue from car sales in 1996 to revenue from truck sales in
: 1996?
: ans 1:2
: 怎麼算怎麼不對 有人可以幫我一下嗎><?
SALES(數量)
1996 1997
cars x 0.89x
truck y 1.07y
REVENUE(數量*單價)
0.89xc+1.07yt=1.01(xc+yt) ----> 0.06yt=0.12xc
所以 xc/yt=1:2
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