The area of Dongting Lake has decreased by 40% in recent years. Its original area was about 4350km**2. What is its current area?
洞庭湖近几年面积减少40%，原来它的面积约为4350km**2，现在它的面积约为多少？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4_350 * (3/5)</gadget>
<output>2_610</output>

<result>2_610</result>