Huaguang Garment Factory completed a profit and tax of 24 million yuan this year, an increase of 20% over last year. Find the profit and tax of last year, and what is the correct formula?
华光服装厂今年完成利税2400万元，比去年增加20%，求去年完成利税多少万元，正确列式的是多少
<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>