The original price of a piece of clothing is 200 yuan, and the current price is 180 yuan. How much is it lower than the original price?
一件衣服原价200元，现价180元，比原价降低了百分之几？
<gadget id="calculator">200 - 180</gadget>
<output>20</output>

<gadget id="calculator">20 / 200</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>