If a jacket sells for 120 yuan, you can earn 20%. If you sell it for 110 yuan, how much can you earn?
一件上衣如果售价120元，则能赚20%，如果售价110元，能赚多少元？
<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">120 / (6/5)</gadget>
<output>100</output>

<gadget id="calculator">110 - 100</gadget>
<output>10</output>

<result>10</result>