Up to now, the actual investment in education projects in the earthquake-stricken areas of Sichuan is about 2.5 million yuan, which is 500,000 yuan more than planned. What percentage is the extra investment?
截至目前为止，四川地震灾区教育项目实际投资约250万元，比计划多投资50万元，多投资了百分之几？
<gadget id="calculator">250 - 50</gadget>
<output>200</output>

<gadget id="calculator">50 / 200</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>