document.write( "Question 1124485: Factories A and B produce all of the computers sold at Cheapo Discount Stores. Factory A produces 4 times as many computers as factory B. The probability that a computer produced by factory A is defective is 0.3 and the probability that one produced by factory B is defective is 0.2. \r
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Algebra.Com's Answer #740799 by ikleyn(52782) $\"\"$ $\"About$

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document.write( "Let assume that factory B produces 100 computers.\r\n" );
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document.write( "Then factory A produces 400 computers, according to the condition.\r\n" );
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document.write( "Of 100 computers produced by B, 20 are defective.\r\n" );
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document.write( "Of 400 computers produced by A, 0.3*400 = 120 are defective.\r\n" );
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document.write( "The probability under the question is   =  = .\r\n" );
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