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Sue’s monthly earnings consist of a monthly salary and a 4 percent com

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Sue’s monthly earnings consist of a monthly salary and a 4 percent com [#permalink]

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New post 27 Dec 2010, 13:58
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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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Sue’s monthly earnings consist of a monthly salary and a 4 percent com [#permalink]

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New post 27 Dec 2010, 14:52
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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?

{Earnings} = {Fixed salary} + 4/100*{Sales - 2,000};
{Earnings} = {Fixed salary} + 4/100*{Sales} - 80;
{Sales} = 25*{Earnings - Fixed salary + 80}.

Given: {Fixed salary for July} = {Fixed salary for August}.
Question: {Sales for July} - {Sales for August} = 25*{Earnings for July - Fixed salary + 80} - 25*{Earnings for August - Fixed salary + 80} = 25{Earnings for July -Earnings for August}.

So, basically, to answer the question, we need to find the difference between the earnings.

(1) Sue’s monthly earnings were $3,620 in July and $3,580 in August. Sufficient.
(2) Sue’s monthly salary was $3,500 in July and in August. Not sufficient.

Answer: A.
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Re: Sue’s monthly earnings consist of a monthly salary and a 4 percent com [#permalink]

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New post 20 Dec 2016, 15:43
Bunuel can we assume it is a fixed salary? Does GMAT assume monthly salary = fixed salary? I would expect it to be specified on test day.
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Re: Sue’s monthly earnings consist of a monthly salary and a 4 percent com [#permalink]

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New post 21 Dec 2016, 01:22
raeann105 wrote:
Bunuel can we assume it is a fixed salary? Does GMAT assume monthly salary = fixed salary? I would expect it to be specified on test day.


The question specifies it perfectly: Sue’s monthly earnings consist of a monthly salary + a 4 percent commission on the portion of her monthly sales that is in excess of $2,000.
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Re: Sue’s monthly earnings consist of a monthly salary and a 4 percent com [#permalink]

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New post 12 Dec 2017, 00:09
Bunuel but what if the fixed salary (monthly salary) was exactly 3,580, which means that there was no commission in August (no monthly sales exceed 2000).
In this case, we will find (1) not sufficient.
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Re: Sue’s monthly earnings consist of a monthly salary and a 4 percent com [#permalink]

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New post 12 Dec 2017, 00:41
nicktsou wrote:
Bunuel but what if the fixed salary (monthly salary) was exactly 3,580, which means that there was no commission in August (no monthly sales exceed 2000).
In this case, we will find (1) not sufficient.


Why not? Did you try to actually calculate and support your claim with some numbers?

{Fixed salary} = 3,580.

{Sales for July} = 25*{3,620 - 3,580 + 80} = 3,000.
{Sales for August} = 25*{3,580 - 3,580 + 80} = 2,000.

The difference = 1,000.

The same result as from the formula above: 25{Earnings for July -Earnings for August} = 25*(3,620 - 3,580) = 1,000.
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Re: Sue’s monthly earnings consist of a monthly salary and a 4 percent com [#permalink]

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New post 12 Dec 2017, 00:55
Bunuel The answer should be C

If the fixed salary is 3,580, which indicates that the sales in August did not exceed 2,000. Thus, (1) is not sufficient to answer the question of "how much greater were her sales in July than in August,".

Because the sales can be any number between 0~2000 in August in this case.

As the result, (2) is also needed to determine whether the sales exceed 2,000 in August. In order to make your equation reasonable and further determine how much greater were the sales in July than in August.

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Re: Sue’s monthly earnings consist of a monthly salary and a 4 percent com   [#permalink] 12 Dec 2017, 00:55
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