To build a research institute, the actual investment was 360,000 yuan, which was 40,000 yuan less than the original plan. How much was the savings?
建设一座研究所，实际投资36万元，比原计划节省了4万元，节省了百分之几？
<gadget id="calculator">36 + 4</gadget>
<output>40</output>

<gadget id="calculator">4 / 40</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>