A certain article of clothing was discounted during a special sale to 4/5 of its original retail price. When the clothing didn't sell, it was discounted even further to 1/2 of its original retail price during a second sale. By what percent did the price of this article of clothing decrease from the first sale to the second sale?	Answers:
A) 50% B) 33.33% C) 40% D) 16.66% E) 12.5%
Say the original retail price of the item was $200.   The price after the first sale = 4/5 * $200 = $160.   The price after the second sale 4/5 *  200= 
<gadget id="calculator">4/5 *  200</gadget>
<output>160</output>
$160.   The price after the second sale= 1/2 * $200 = $100.   The percent change from the first sale to the second 1/2 *  200= 
<gadget id="calculator">1/2 *  200</gadget>
<output>100</output>
$100.   The percent change from the first sale to the second= (160 - 100) / 150 = 1/3 = 40%.   Answer: 40%.
<result>C</result>
A certain article of clothing was discounted during a special sale to 4/5 of its original retail price. When the clothing didn't sell, it was discounted even further to 1/2 of its original retail price during a second sale. By what percent did the price of this article of clothing decrease from the first sale to the second sale?