A batch of oranges is 500 kilograms. After 20% of the oranges are sold, 20% will be shipped in. How many kilograms of this pile of oranges are there now?
一批橘子500千克，卖出20%后，有运进20%，这堆橘子现在还有多少千克．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">500 * (4/5) * (6/5)</gadget>
<output>480</output>

<result>480</result>