The time for a worker to make a part is shortened from 2.5 minutes to 1.2 minutes. How much time is shortened for a part?
某工人做一个零件的时间由2.5分钟缩短到1.2分钟，做一个零件所用的时间比原来缩短了百分之几？
<gadget id="calculator">2.5 - 1.2</gadget>
<output>1.3</output>

<gadget id="calculator">1.3 / 2.5</gadget>
<output>0.52</output>

<result>0.52</result>