After the price of a product is reduced by 1,000 yuan, the price is 4,000 yuan. What percentage is the price reduction?
某商品降价1000元后，售价4000元，降价百分之几？
<gadget id="calculator">4_000 + 1_000</gadget>
<output>5_000</output>

<gadget id="calculator">1_000 / 5_000</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>