Nanshan Hope Primary School plans to invest 1.6 million yuan to build a teaching building, but the actual investment is 1.312 million yuan. How much will the investment be saved?
南山希望小学计划投资160万元建一座教学楼，实际投资131.2万元，节约投资百分之几？
<gadget id="calculator">160 - 131.2</gadget>
<output>28.8</output>

<gadget id="calculator">28.8 / 160</gadget>
<output>0.18</output>

<result>0.18</result>