What is the original price of a piece of clothing, the price is reduced by 20%, and the current price is 160 yuan.
一件衣服原价多少元，降价20%，现价160元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">160 / (4/5)</gadget>
<output>200</output>

<result>200</result>