To build a building, the actual investment is 1.2 million yuan, which saves 400,000 yuan compared with the plan. How much is the savings?
建一座大楼，实际投资120万元，比计划节约40万元，节约了百分之几？
<gadget id="calculator">120 + 40</gadget>
<output>160</output>

<gadget id="calculator">40 / 160</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>