Qinqian Primary School built a comprehensive building, the actual investment was 900,000 yuan, and 300,000 yuan was saved. How much was the savings?
勤勉小学建一幢综合楼，实际投资90万元，节约了30万元，节约了百分之几？
<gadget id="calculator">90 + 30</gadget>
<output>120</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

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