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by ruplun » Wed Jul 14, 2010 12:29 am
A number of light bulbs were purchased to illuminate a gym. However, only 2/3 of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or $96, was reimbursed. How much money was spent on illuminating the gym?


(A) 360
(B) 320
(C) 384
(D) 364
(E) 160


What will be the solution..please advice?
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by selango » Wed Jul 14, 2010 1:05 am
Number of light bulbs=n

2/3 of n is needed

1/3*n=160

n=480

2/3*480=320 bulbs are needed

Let x be the cost of 160 bulbs.

Now 60/100*x=96

x=160

40/100*160=64

160 bulbs cost 160.

1 bulb cost 1.

320(1)+64=384 or 480-96=384

Option C
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