A product is 120 yuan cheaper than the original price after being sold with a 20% discount. What is the original price of this product?
一件商品八折出售后比原价便宜120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">120 / (1/5)</gadget>
<output>600</output>

<result>600</result>