Wangzhuang Coal Mine produces 2.25 million tons of coal this year, an increase of 250,000 tons over last year. What percentage increase?
王庄煤矿今年产煤225万吨，今年比去年增产25万吨．增产百分之几？
<gadget id="calculator">225 - 25</gadget>
<output>200</output>

<gadget id="calculator">25 / 200</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>