A factory expanded a factory building and planned to invest 500,000 yuan, but it only cost 480,000 yuan. How much was the savings?
某厂扩建一座厂房，计划投资50万元，结果只用了48万元，节省了百分之几？
<gadget id="calculator">50 - 48</gadget>
<output>2</output>

<gadget id="calculator">2 / 50</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>