The daily output of the cement plant has increased from the original 300 tons to 400 tons, by what percentage?
水泥厂日产量由原来的300吨增加到了400吨，增加了几分之几？
<gadget id="calculator">400 - 300</gadget>
<output>100</output>

<gadget id="calculator">100 / 300</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>