The current price of a piece of clothing is 320 yuan, which is 80 yuan lower than the original price. How much is the price of this dress lower than the original price?
一件衣服现价320元，这件衣服的价格比原来降低了80元．问这件衣服的价格比原来降低了百分之几？
<gadget id="calculator">80 + 320</gadget>
<output>400</output>

<gadget id="calculator">80 / 400</gadget>
<output>1/5 = around 0.2</output>

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