Obviously the school needs to import some sports equipment. The shopping mall is engaged in promotional activities. The current price of a fitness machine is 1,600 yuan, which is 400 yuan lower than the original price. How much is the reduction?
明明学校要进一些体育器材．商场搞促销让利活动，一种健身器现价是1600元，比原来降低了400元，降低了百分之几？
<gadget id="calculator">1_600 + 400</gadget>
<output>2_000</output>

<gadget id="calculator">400 / 2_000</gadget>
<output>1/5 = around 0.2</output>

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