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Statistics

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by anujan007 » Thu Jul 12, 2012 4:42 pm
The answer choices would have helped to plug in.

Nevertheless, (sum of all sales/number of sales) = average per sale

x = original value of sales
n= original number of sales

(x+2000)/(n+1) = 900 ---> Eqn I

(x/n) = 900 - 100 = 800 ---> Eqn II

n = 11, n+1 =12.

Total number of Sales = 12.

Is this the correct answer?
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