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 Post subject: GMAT Data Analysis
PostPosted: Sun Nov 14, 2010 3:36 am 
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Joined: Sun May 30, 2010 3:15 am
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The above graph lists the monthly sales (in $100,000 increments) at a car dealership. For January and February, the dealership had two sales agents. The dealership added a sales agent in March and one more in May. What was the percent increase in sales per agent in June compared to January?

A. 50%
B. 100%
C. 125%
D. 200%
E. 400%

(B) In January, the dealership had 2 agents and had sales of $200,000, or $100,000 per agent. An agent was added to the sales force in March (making 3) and then one more was added in May (making 4). This leaves 4 agents on the sales force for June, when the dealership sold $800,000 or $200,000 per agent ($800,000/4). We can find the percent difference by dividing the difference between the two per-agent amounts by the per-agent amount in January:
Percent Difference = ($200,000 – $100,000) / ($100,000)= 100,000 ÷ 100,000 = 1 or 100%. The correct answer is choice (B).

The trap answer is choice (D). $200,000 per agent is double $100,000 per agent. But remember that the question asks for the percent increase. $200,000 represents 200% of $100,000, but only 100% more than $100,000.
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In this question in May the chart says 900,000 not 800,000 which would make the answer C.


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 Post subject: Re: mGMAT Data Analysis
PostPosted: Sun Nov 14, 2010 3:48 am 
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Joined: Sun May 30, 2010 2:23 am
Posts: 498
The monthly sales in May were $900 000 indeed, but the questions asks for the percent increase in sales per agent in JUNE compared to January. The monthly sales in June were $800 000.


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