Xinhua Primary School built a plastic runway. The planned investment was 200,000 yuan, but the actual investment was 180,000 yuan. What percentage of the actual investment was the plan?
新华小学修一条塑胶跑道，计划投资20万元，实际投资18万元，实际投资是计划的百分之几？
<gadget id="calculator">18 / 20</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>