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# M09-10

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Math Expert
Joined: 02 Sep 2009
Posts: 54434

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16 Sep 2014, 00:39
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Difficulty:

5% (low)

Question Stats:

94% (00:52) correct 6% (01:43) wrong based on 71 sessions

A wholesaler sells computers on following conditions: the first 100 computers cost $500 each and each computer above 100th costs$400. If the wholesaler received $57,600 as a result of the deal, how many computers did he sell? A. 109 B. 117 C. 119 D. 121 E. 123 _________________ Math Expert Joined: 02 Sep 2009 Posts: 54434 Re M09-10 [#permalink] ### Show Tags 16 Sep 2014, 00:39 1 Official Solution: A wholesaler sells computers on following conditions: the first 100 computers cost$500 each and each computer above 100th costs $400. If the wholesaler received$57,600 as a result of the deal, how many computers did he sell?

A. 109
B. 117
C. 119
D. 121
E. 123

Say the wholesaler sold $$n$$ computers. Then:

$$100*500+(n-100)*400=57,600$$;

$$(n-100)*400=7,600$$;

$$n-100=19$$;

$$n=119$$.

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Intern
Joined: 02 Aug 2017
Posts: 6
GMAT 1: 710 Q46 V41
GMAT 2: 600 Q39 V33

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03 Sep 2017, 16:06
100*500 = 50,000 -> leaves 7,600

7,600/400=x (note here that 20x400=8,000, so -400 = 7,600)

x=19

Re: M09-10   [#permalink] 03 Sep 2017, 16:06
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# M09-10

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