Master Zhang makes a kind of parts. It used to take 0.3 hours to make a part. After improving the technology, it only takes 0.25 hours to make a part now. It took the time to make 100 pieces before, how many parts can be made now?
张师傅做一种零件，原来做一个要0.3小时，改进技术后，现在做一个只要0.25小时．原来做100个的时间，现在能做零件多少个？
<gadget id="calculator">100 / 0.25</gadget>
<output>400</output>

<gadget id="calculator">0.3 * 400</gadget>
<output>120</output>

<result>120</result>