There is an air conditioner, the original price is 1,600 yuan, and the price is increased to 2,000 yuan. How much is the increase?
有一台空调，原价1600元，涨价后卖2000元，涨了百分之几？
<gadget id="calculator">2_000 - 1_600</gadget>
<output>400</output>

<gadget id="calculator">400 / 1_600</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>