What percentage is 2.5 tons more than 2 tons?
2.5吨比2吨多百分之几？
<gadget id="calculator">2.5 - 2</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<result>0.25</result>