Bunuel wrote:
A certain computer manufacturing firm last year produced 82 percent of its computers using parts made by its subsidiary company. If the remaining 10,800 computers were produced using parts purchased from another parts manufacturer, how many computers were produced by the computer manufacturing firm altogether?
A. 5,400
B. 6,000
C. 18,000
D. 60,000
E. 600,000
ALWAYS scan the answer choices before performing any calculations. In this case, most of the answer choices are spread out nicely, so I might get a little aggressive with my ESTIMATION.
A certain firm produced 82 percent of its computers using parts made by its subsidiary companySo, about 4/5 of the computers used parts from subsidiary company
This leaves 1/5 of the computers REMAINING
...the REMAINING 10,800 computers were produced using parts purchased from another parts manufacturerAh! So, 10,800 represents the REMAINING 1/5 of the computers.
...how many computers were produced by the computer manufacturing firm altogether?10,800 represents 1/5 of the computers, the TOTAL number of computers ≈ (10,800)(5) ≈ (11,000)(5) ≈ 55,000
When we check the answer choices, we see that D is the ONLY answer that's close to 55,000
For more on when to estimate, check out this video -
http://www.gmatprepnow.com/module/gener ... video/1111Cheers,
Brent
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