A factory expansion plan invests 5 million yuan, but actually saves 450,000 yuan. What percentage of investment is saved?
一个工厂扩建计划投资500万元，实际节约了45万元，节约投资百分之几？
<gadget id="calculator">45 / 500</gadget>
<output>9/100 = around 0.09</output>

<result>9/100 = around 0.09</result>