A cement factory actually produced 30,000 tons of cement in the first half of the year, 6,000 tons more than the original plan. What percentage increase in production in the first half of the year compared to the original plan?
某水泥厂上半年实际生产水泥3万吨，比原计划多生产水泥0.6万吨．上半年比原计划增产百分之几？
<gadget id="calculator">3 - 0.6</gadget>
<output>2.4</output>

<gadget id="calculator">0.6 / 2.4</gadget>
<output>0.25</output>

<result>0.25</result>