A store bought 5 dozen lamps at $30 per dozen and sold them all at $15 per lamp.The profit on each lamp was what percent of its selling price?
20%
50%
83~$\frac{1}{3}$~%
100%
500%
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(15-30/12)/15 = 0.8333
Dozen = 12
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(15-30/12)/15 = 0.8333
Dozen = 12