Uncle Li sells two sets of skirts at a price of 360 yuan each, one of which is 20% higher than the purchase price, and the other is 20% lower than the purchase price. Does Uncle Li make a profit or a loss?
李叔叔以每套360元的价格卖了两套裙子，其中一套比进价高20%，另一套比进价低20%，李叔叔是赢利还是亏损．
<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">360 / (4/5)</gadget>
<output>450</output>

<gadget id="calculator">450 - 360</gadget>
<output>90</output>

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

<gadget id="calculator">360 / (6/5)</gadget>
<output>300</output>

<gadget id="calculator">360 - 300</gadget>
<output>60</output>

<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<result>30</result>