[問題]GWD07Q19

[sugarcane]

Q19: A certain company that sells only cars and trucks reported that revenues from cars sales in 1997 were down 11 percent form 1996 and revenues from truck sales in1997 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 revenues 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

[ypschool]

1997年，car降11%，truck升7%。
1997年，car和truck總共升了1%。可列式得:
(1-11%)C + (1+7%)T = (1+1%)*(C+T)
整理後 89%*C + 107%*T = 101%*C + 101%*T
整理後 6%*T = 12%*C
所以 C : T = 1 : 2

[chihwa]

http://www.formosamba.com/phpBB3/viewtopic.php?t=2439