Xiaojun's family has had a bumper harvest of apples this year, with an output of 2,400 kilograms, an increase of 20% over last year. How many kilograms of apples were produced last year?
小军家今年苹果大丰收，产量达到2400千克，比去年增产二成．去年产苹果多少千克？
<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>