[問題]天山03-06

[applepeko]

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.

這題我選C..有人可以教我嗎

[lance921]

我會選A
因為不需要知道底薪
假設 七月業績為X 八月為Y
X*4% - Y*4% = 3620-3580 = 40
X-Y 就是題目問的

[applepeko]

我會選A
因為不需要知道底薪
假設 七月業績為X 八月為Y
X*4% - Y*4% = 3620-3580 = 40
X-Y 就是題目問的

為什麼是X*4% - Y*4% = 3620-3580 = 40
題目不是說earnings=Salary+(Sales-2000)*0.04嗎??
因為我覺得很複雜所以搞不懂...
我的列式錯了嗎??
請幫我解答一下喔!!!感激不盡

[lance921]

Salary+(Sales_in_July -2000)*0.04 in July
- Salary+(Sales_in_Aug -2000)*0.04 in Aug
-----------------------------------------------
0 (Sales_in_July - Sales_in_Aug ))*0.04

題目也說底薪不變 所以無論底薪多少 我都不需要知道 因為一減都變0了
至於那兩千是應該要算進去的
不過減後也是0所以我就懶得列了
小姐請問你是幾年次的 你是建構數學下的犧牲品嗎
每一題的考試時間不會很長
不用算的就不要花時間算下去 沒有必要把每個數值都算出來

[applepeko]

錯愕...所以我列式是對的嗎...
有這麼慘歐...建構數學下的犧牲品......