A commodity costs 80 yuan. 12% increase in sales. A customer bought the product, paid the boss 100 yuan in counterfeit notes, and asked the boss how much money he lost in total?
一件商品成本80元．提高12%出售．一个顾客买下了这件商品，付给老板100元假钞，问老板总共亏损了多少钱？
<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">1 + (3/25)</gadget>
<output>28/25 = around 1.12</output>

<gadget id="calculator">80 * (28/25)</gadget>
<output>448/5 = around 89.6</output>

<gadget id="calculator">100 - (448/5)</gadget>
<output>52/5 = around 10.4</output>

<gadget id="calculator">80 + (52/5)</gadget>
<output>452/5 = around 90.4</output>

<result>452/5 = around 90.4</result>