The car factory planned to produce 12,600 cars last year, but in the first half of the year it completed the plan (5/9), and in the second half of the year it produced the same number as the first half. How many cars were overproduced last year?
汽车厂去年计划生产汽车12600辆，结果上半年完成计划的(5/9)，下半年生产的与上半年同样多．去年超产多少辆？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(5/9) * 2</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">(10/9) - 1</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">12_600 * (1/9)</gadget>
<output>1_400</output>

<result>1_400</result>