One-sixth of the light switches produced by a certain factory are defective. Four-fifths of the defective switches are rejected and 1/20 of the non defective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
Pick one:	A) 4%	B) 5%	C) 6%	D) 11%	E) 16%
1/6 of the switches are defective.   The defective switches that are not rejected are 1/5*1/6 = 1/30 = 4/120 of all switches.   The non defective switches that are sold are 5/6*19/20 = 95/120 of all switches.   The percent of switches sold that are defective is 4/99 which is about 4%.   The answer is 4%.
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One-sixth of the light switches produced by a certain factory are defective. Four-fifths of the defective switches are rejected and 1/20 of the non defective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?