Guangming Breeding Plant originally planned to use 250,000 tons of materials, but actually used 218,000 tons of materials. What percentage was saved?
光明养殖厂原计划用料25万吨，实际用料21.8万吨，节约了百分之几？
<gadget id="calculator">25 - 21.8</gadget>
<output>3.2</output>

<gadget id="calculator">3.2 / 25</gadget>
<output>0.128</output>

<result>0.128</result>