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# Sue's monthly earnings consist of a monthly salary and a 4

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Director
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Sue's monthly earnings consist of a monthly salary and a 4 [#permalink]  08 Oct 2005, 03:19
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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.
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Director
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[#permalink]  08 Oct 2005, 19:10
I chose C too. OA aint C!
Im getting a bit panicky....am i missing something or ive lost even the basic stuff???
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Cheers, Rahul.

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[#permalink]  09 Oct 2005, 16:35
rahulraao wrote:
I chose C too. OA aint C!
Im getting a bit panicky....am i missing something or ive lost even the basic stuff???

i will go for A will explain later if i am correct
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Manager
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[#permalink]  09 Oct 2005, 16:47
I would say A. If the salary is a constant the difference between the two totals will represent only the sales commision difference.

ie. July = salary + .04y
August = salary + .04x

The comission difference would be .04y-.04x = $40 and ($40/.04) = total sales difference.

B.
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[#permalink]  10 Oct 2005, 04:49
Quote:
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.

(1) is sufficient. The difference between \$3620 and 3580 is the difference between the 4% of the commision of her sales in July and in August.
Earnings July = salary + 4%Sales in July
Earnings August=salary+4%sales in August

--->4%(Sales in July-Sales in August)=Earnings in July - Earnings in August.

--->(Sales in July-Sales in August)=(Earnings in July - Earnings in August)/0.04

(2) is not sufficient since is not possible to calculate the sales revenue for each month.

So the correct answer is A
[#permalink] 10 Oct 2005, 04:49
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# Sue's monthly earnings consist of a monthly salary and a 4

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