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# One-fifth of the light switches produced by a certain

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Senior Manager
Joined: 29 Jun 2005
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One-fifth of the light switches produced by a certain [#permalink]

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07 May 2006, 10:23
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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%

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Manager
Joined: 27 Mar 2006
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07 May 2006, 13:27
I am getting 20% ...I took the missing amount as 4/5th as well...

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Intern
Joined: 23 Feb 2006
Posts: 39

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12 May 2006, 04:14
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

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Director
Joined: 24 Oct 2005
Posts: 659

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Location: London

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12 May 2006, 04:32
I am also getting 20% if we take the number as 4/5

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Senior Manager
Joined: 08 Jun 2004
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12 May 2006, 04:43
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

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Senior Manager
Joined: 08 Jun 2004
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12 May 2006, 04:57

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Senior Manager
Joined: 29 Jun 2005
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12 May 2006, 07:35
I'm sorry for mistake.
.....1/20 of the nondefective switches are rejected by mistake.

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Senior Manager
Joined: 08 Jun 2004
Posts: 494

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12 May 2006, 08:34
Dilshod wrote:
I'm sorry for mistake.
.....1/20 of the nondefective switches are rejected by mistake.

So buddy the answer is B - 5%.

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12 May 2006, 08:34
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