A kind of clothing, whose original price is 500 yuan, is now priced at 400 yuan. How much is the current price lower than the original price?
一种服装，原价500元，现在售价400元，现价比原价降低了百分之几？
<gadget id="calculator">500 - 400</gadget>
<output>100</output>

<gadget id="calculator">100 / 500</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>