The school built a new comprehensive teaching building with an actual investment of 4.8 million yuan, which was 200,000 yuan less than the plan. How much was the savings?
学校新建综合教学楼，实际投资480万元，比计划节约20万元，节约了百分之几？
<gadget id="calculator">480 + 20</gadget>
<output>500</output>

<gadget id="calculator">20 / 500</gadget>
<output>1/25 = around 0.04</output>

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