product is sold at 80% of the original price, which is 40 yuan cheaper than the original price. What is the current price of this item.
一件商品按原价的80%销售，比原便宜40元．这件商品的现价是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 / (1/5)</gadget>
<output>200</output>

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

<result>160</result>