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

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Joined: 28 Aug 2010
Posts: 265
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Kudos [?]: 188 [0], given: 11

Sue s monthly earnings consist of a monthly salary and a 4 [#permalink]  27 Dec 2010, 12:58
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Difficulty:

45% (medium)

Question Stats:

55% (02:01) correct 45% (00:26) wrong based on 31 sessions
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.
[Reveal] Spoiler: OA

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Ajit

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Joined: 02 Sep 2009
Posts: 27590
Followers: 4342

Kudos [?]: 42876 [1] , given: 6125

Re: Sue s monthly earnings consist of a monthly salary and a 4 [#permalink]  27 Dec 2010, 13:52
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Expert's post
ajit257 wrote:
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.

can some explain a better way to deal with such problems.

Sue's earnings=fixed salary+4/100(sales-2,000) --> earnings=fixed salary+4/100*sales-80 --> sales=25(earnings-fixed salary+80).

Given: fixed salary(July)=fixed salary(August). Question: sales(July)-sales(August)=25(earnings(July)-fixed salary+80)-25(earnings(August)-fixed salary+80)=25(earnings(July)-earnings(August)) So, all we need is the values of earnings(July) and earnings(August)

(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.

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Re: Sue s monthly earnings consist of a monthly salary and a 4   [#permalink] 27 Dec 2010, 13:52
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