The fertilizer factory planned to produce 540 tons of fertilizer last year, but it completed the plan in the first half of the year (5/9), and in the second half of the year (2/3). How many tons was the overproduction in the whole year?
化肥厂去年计划生产化肥540吨，结果上半年完成计划的(5/9)，下半年完成计划的(2/3)，全年超产多少吨？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">540 * (5/9)</gadget>
<output>300</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">540 * (2/3)</gadget>
<output>360</output>

<gadget id="calculator">300 + 360</gadget>
<output>660</output>

<gadget id="calculator">660 - 540</gadget>
<output>120</output>

<result>120</result>