The actual investment in the new teaching building of the Experimental Primary School was 2.32 million yuan, which was 180,000 yuan less than the original plan. How much was the savings?
实验小学新建教学楼，实际投资232万元，比原计划节约了18万元，节约了百分之几？
<gadget id="calculator">232 + 18</gadget>
<output>250</output>

<gadget id="calculator">18 / 250</gadget>
<output>9/125 = around 0.072</output>

<result>9/125 = around 0.072</result>