To build a primary school, the planned cost is 4 million yuan, but the actual cost is 3.8 million yuan. How much is the savings?
新建一所小学，计划用款400万元，实际用去380万元，节约了百分之几？
<gadget id="calculator">400 - 380</gadget>
<output>20</output>

<gadget id="calculator">20 / 400</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>