[求助]天山3-6

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.

key：A

mine：c

3580=Salary August+4%(Sales August-2000) b

会不会有Sales August<2000的情况呢

这样那两个式子就不成立

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realheart发表于 2006-4-8 04:44 | 只看该作者

是道争议题

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susanoffice发表于 2006-4-8 15:35 | 只看该作者

这道题很简单，选a。monthly salary相等。monthly commission有差别。a中告诉你两者monthly earnings(monthly salary and monthly commission之和）.只需将两数相减除以4%就ok了。b没有告诉monthly commission,只知monthly salary,所以无法得出答案。

(3560-3580)/0.04

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