If a product is sold at a price of 100 yuan, you can earn 20 yuan. If the product is sold at a loss of 10%, how much is the loss?
一件商品按100元的价格售出，可以赚20元．如果这件商品售出时亏损10%，亏损了多少元．
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 * (1/10)</gadget>
<output>8</output>

<result>8</result>