A car factory produced 45% of the annual plan in the first half of last year, and produced 1,560 cars in the second half of the year. The result was 10% more than the original plan last year. How many cars did the factory originally plan to produce last year?
某汽车厂去年上半年生产的汽车完成了全年计划的45%，下半年生产1560辆汽车，结果去年比原计划超产10%，去年该厂原计划生产多少辆汽车？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(11/20) + (1/10)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1_560 / (13/20)</gadget>
<output>2_400</output>

<result>2_400</result>