The fertilizer factory plans to produce 2,400 tons of fertilizers in the whole month. In fact, it completed the plan in half a month (July 12), and the production in the second half of the month was the same as the first half.
化肥厂计划全月生产化肥2400吨，实际上半月完成计划的(7/12)，下半月生产的和上半月同样多，实际超产多少吨？
<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(7/12) - 1</gadget>
<output>-5/12 = around -0.416667</output>

<gadget id="calculator">(7/12) + (-5/12)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2_400 * (1/6)</gadget>
<output>400</output>

<result>400</result>