After a 20% discount on a product, the original price is 40 yuan lower than the original price. What is the original price of this product?
一件商品打八折后比原价降了40元，这件商品原价多少元．
<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>

<result>200</result>