The current price of a product is 4 yuan, which is 1 yuan lower than the original price. How much is the reduction?
某商品现在售价4元，比原价降低了1元，降低了百分之几？
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

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

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