To build a factory building, the planned investment is 125,000 yuan, but the actual cost is only 100,000 yuan. How much is the actual investment saved compared to the plan?
修建一座厂房，计划投资12.5万元，实际只用了10万元，实际投资比计划节约百分之几？
<gadget id="calculator">12.5 - 10</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 / 12.5</gadget>
<output>0.2</output>

<result>0.2</result>