Yuhong Primary School built a teaching building, planned to spend 900,000 yuan, but actually saved 180,000 yuan. How much was the savings?
育红小学修建一幢教学楼，计划用90万元，实际节约了18万元，节约了百分之几？
<gadget id="calculator">18 / 90</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>