A self-employed businessman sells two coats at the same time in one transaction, each of which is sold at 135 yuan. If calculated according to the cost, one of them makes a profit of 25% and the other one loses 25%. How much does the self-employed person lose in this transaction?
某个体户在一次买卖中，同时卖两件上衣，每件都以135元出售，若按成本计算，其中一个盈利25%，另一件亏损25%，在这次买卖中这个个体户是赔多少元
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">135 / (3/4)</gadget>
<output>180</output>

<gadget id="calculator">180 - 135</gadget>
<output>45</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">135 / (5/4)</gadget>
<output>108</output>

<gadget id="calculator">135 - 108</gadget>
<output>27</output>

<gadget id="calculator">45 - 27</gadget>
<output>18</output>

<result>18</result>