Two pieces of clothing, A and B, are sold for 120 yuan, A loses 20%, and B makes a profit of 20%. Is the sum of these two transactions a loss or a gain?
甲、乙两件服装都以120元卖出，甲件亏损20%，乙件赢利20%，这两次买卖合计是亏还是赚？
<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">120 / (4/5)</gadget>
<output>150</output>

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

<gadget id="calculator">120 / (6/5)</gadget>
<output>100</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">100 - 240</gadget>
<output>-140</output>

<gadget id="calculator">150 + (-140)</gadget>
<output>10</output>

<result>10</result>