The current price of a commodity is 160 yuan, which is 40 yuan lower than the original price. How much is the reduction?
一种商品现价160元，比原价降低了40元，降低了百分之几？
<gadget id="calculator">160 + 40</gadget>
<output>200</output>

<gadget id="calculator">40 / 200</gadget>
<output>1/5 = around 0.2</output>

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