Uncle Li's family harvested 5,400 kilograms of rice this year, an increase of 20% over last year. How many kilograms of rice did Uncle Li's family harvest last year?
李伯伯家今年收稻谷5400千克，比去年增产两成，李伯伯家去年收稻谷多少千克？
<gadget id="calculator">4_800 / 1.2</gadget>
<output>4_000</output>

<result>4_000</result>