The automobile factory produces 2,400 vehicles this year, an increase of 20% over last year. How many vehicles were produced last year?
汽车厂今年生产汽车2400辆，比去年增产20%，去年生产汽车多少辆？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2_400 / (6/5)</gadget>
<output>2_000</output>

<result>2_000</result>