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[問題]GWD13-18

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[問題]GWD13-18

帖子kwtluck » 2006-09-06 15:20

麻煩各位大大解惑,謝謝 :smile

GWD13-Q18:

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?

A. 1 : 2
B. 4 : 5
C. 1 : 1
D. 3 : 2
E. 5 : 3

Ans: A
kwtluck
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帖子FrankChang » 2006-09-06 17:07

假設1996年car的獲利為c,truck的獲利為t,
問1996年獲利比c/t?
依照題意可列出0.89c+1.07t=1.01(c+t),
式子同除t可得一個未知數為c/t的一元一次方程式,
解得c/t=1/2.
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帖子kwtluck » 2006-09-06 19:55

FrankChang 大大
你真是個大好人 ;yes;
感恩 :laugh
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