A mobile phone is now priced at 1200 yuan, which is 400 yuan lower than before. By what percentage?
一种手机，现在售价是1200元，比原来降低了400元．降低了百分之几？
<gadget id="calculator">1_200 + 400</gadget>
<output>1_600</output>

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

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