The price of a product after a 20% price reduction is 120 yuan. What is the original price of this product?
一件商品降价20%后的价格是120元，这件商品原价是多少元．
<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">120 / (4/5)</gadget>
<output>150</output>

<result>150</result>