A shopping mall sold two air conditioners at a uniform preferential price of 1980 yuan. Although one of them made a profit of 10%, the other lost 10%, so the result was a loss. How much did you lose.
某商场以统一优惠价格1980元售山两台空调．虽然其中一台赢利10%，但另一台亏损10%，因此结果亏损．亏损了多少元．
<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">1_980 / (9/10)</gadget>
<output>2_200</output>

<gadget id="calculator">2_200 - 1_980</gadget>
<output>220</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">1_980 / (11/10)</gadget>
<output>1_800</output>

<gadget id="calculator">1_980 - 1_800</gadget>
<output>180</output>

<gadget id="calculator">220 - 180</gadget>
<output>40</output>

<result>40</result>