To build a teaching building, the planned investment is 1.5 million yuan. The actual investment is 1/5 less than the planned investment. How much is the savings compared to the planned investment?
建造一幢教学大楼，计划投资150万元，实际投资比计划节省(1/5)，比计划投资节省多少万元？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<result>30</result>