GWD9-6 争议题 A 或C

Kath1985 · 发表于 2012-10-21 15:28:08

Q6:

Sue’s monthly earnings consist of a monthly salary and a 4 percent commission on the portion of her monthly sales that is in excess of $2,000.If Sue’s monthly salary was the same in July as in August, how much greater were her sales in July than in August?

(1)Sue’s monthly earnings were $3,620 in July and $3,580 in August.

(2)Sue’s monthly salary was $3,500 in July and in August.

答案A 有人说C

我认为是A，思路如下，请问哪个步骤错了 ?

第一步:将条件一整理成联立方程式: (令X= 7月sales、 Y=8月sales)

( X -2000)4% + Base = 3620式子一

(Y - 2000)4% + Base = 3580式子二

第二步: 将式子一减式子二消掉共同的Base，得出

( X -2000)4% - (Y - 2000)4% = 40 式子三

第三步: 将式子三通分、得出X-Y值

0.04( X -2000) - 0.04( Y -2000) = 40

4( X -2000) - 4( Y -2000) = 4000 (通分)

( X -2000) - ( Y -2000) = 1000 à得出X-Y=1000

Vin0960 · 发表于 2017-11-29 01:23:09

Only if the sales greater than $2000, you could use this way. (C) is correct.

GWD9-6 争议题 A 或C

所属分类: GMAT考试

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