The school built a comprehensive building, with an actual investment of 1.2 million yuan and a saving of 300,000 yuan. How much was the savings?
学校建综合楼，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>