mobile phone store has two mobile phones, A and B, both priced at 990 yuan. The mobile phone A is a new product, earning 10%, and the mobile phone B is an old model, losing 10%. If one of these two mobile phones is sold today , Did the mobile phone store make or lose?
某手机店有甲乙两款手机，售价都是990元，甲款手机是新品，赚了10%，乙款手机是旧款，赔了10%，如果今天这两款手机各售出一部，这家手机店是赚了还是赔了？
<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">990 / (9/10)</gadget>
<output>1_100</output>

<gadget id="calculator">1_100 - 990</gadget>
<output>110</output>

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

<gadget id="calculator">990 / (11/10)</gadget>
<output>900</output>

<gadget id="calculator">990 - 900</gadget>
<output>90</output>

<gadget id="calculator">110 - 90</gadget>
<output>20</output>

<result>20</result>