If you sell a coat for 92 yuan, you can earn 15%. If you sell it for 100 yuan, how much can you earn?
一件上衣，若卖92元，可赚15%，若卖100元，可赚多少元．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">92 / (23/20)</gadget>
<output>80</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<result>20</result>