Wangzhuang Coal Mine produced 2.5 million tons of coal last year, an increase of 250,000 tons this year compared to last year. What percentage increase?
王庄煤矿去年产煤250万吨，今年比去年增产25万吨．增产百分之几？
<gadget id="calculator">25 / 250</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>