Tongxin County Experimental Primary School built a special education building, the actual investment was 1.2 million yuan, and 300,000 yuan was saved. How much was the savings?
同心县实验小学建特殊教育楼房，实际投资120万元，节约了30万元，节约了百分之几？
<gadget id="calculator">120 + 30</gadget>
<output>150</output>

<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>