A store sells two different calculators, each of which is sold at 90 yuan. One of them has a 20% profit and the other has a 20% loss. In this transaction, how much is the store’s profit and loss?
商店售出两只不同计算器，每只均以90元成交，其中一只盈利20%，另一只亏损20%，则在此次买卖中，该店的盈亏情况是亏本多少元
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">90 / (6/5)</gadget>
<output>75</output>

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

<gadget id="calculator">90 / (4/5)</gadget>
<output>225/2 = around 112.5</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">(225/2) - 180</gadget>
<output>-135/2 = around -67.5</output>

<gadget id="calculator">75 + (-135/2)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>