A company invested 180,000 yuan to build a primary school in Qinghe County, which saved 20,000 yuan compared to the plan. How much was the savings?
某公司在清河县投资18万元新建一所小学，比计划节约2万元，节约了百分之几？
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>