A certain vegetable just came into the market, and the selling price was 20% higher than the wholesale price. One month later, the selling price dropped by 10%. How much is the wholesale price of this vegetable per kilogram?
某蔬菜刚上市，售价比批发价高出20%，一个月后，售价降了10%，这时每千克卖3.24元．这种蔬菜每千克的批发价是多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<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">3.24 / (9/10) / (6/5)</gadget>
<output>3</output>

<result>3</result>