A product is currently priced at 420 yuan, and the current price is 80 yuan lower than the original price. How much is the price reduction?
一种商品现在售价420元，现价比原价降低了80元，降价百分之几？
<gadget id="calculator">420 + 80</gadget>
<output>500</output>

<gadget id="calculator">80 / 500</gadget>
<output>4/25 = around 0.16</output>

<result>4/25 = around 0.16</result>