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One-fifth of the light switches produced by a certain

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Senior Manager
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One-fifth of the light switches produced by a certain [#permalink] New post 07 May 2006, 09:23
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One-fifth of the light switches produced by a certain factory are defective. Four-fifths of the defective switches are rejected and of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
(A) 4%
(B) 5%
(C) 6.25%
(D) 11%
(E) 16%
Manager
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 [#permalink] New post 07 May 2006, 12:27
I am getting 20% ...I took the missing amount as 4/5th as well...
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 [#permalink] New post 12 May 2006, 03:14
Def | Non-Def | Total
Rej 16 64 80
Non Rej 4 16 20
Total 20 80 100

Sold non rejected =4+16 from them 4 defective so 4/20=20% defective
Director
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 [#permalink] New post 12 May 2006, 03:32
I am also getting 20% if we take the number as 4/5
Senior Manager
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 [#permalink] New post 12 May 2006, 03:43
Of course we missed the number in this sentence.

Four-fifths of the defective switches are rejected and UNKNOWN of the nondefective switches are rejected by mistake
Senior Manager
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 [#permalink] New post 12 May 2006, 03:57
Hey Yurik, ask your countrymen to give us the correct question. :wink:
Senior Manager
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 [#permalink] New post 12 May 2006, 06:35
I'm sorry for mistake.
.....1/20 of the nondefective switches are rejected by mistake.
Senior Manager
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 [#permalink] New post 12 May 2006, 07:34
Dilshod wrote:
I'm sorry for mistake.
.....1/20 of the nondefective switches are rejected by mistake.


So buddy the answer is B - 5%. :wink:
  [#permalink] 12 May 2006, 07:34
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