The 20% discount for a piece of clothing is 160 yuan. How much is the current price cheaper than the original price?
一件衣服打八折是160元，现价比原价便宜多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">200 - 160</gadget>
<output>40</output>

<result>40</result>