To build a building, the actual investment is 2 million yuan, and 500,000 yuan is saved. What percentage is the savings?
建造一栋大楼，实际投资200万元，节约了50万元，节约了百分之几？
<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">50 / 250</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>