If a piece of clothing is sold for 100 yuan, the merchant can make a profit of 25%, and if it is sold for 60 yuan, how much will the merchant lose.
一件衣服若卖100元，商家可赚钱25%，若卖60元，商家则要亏本多少元．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">100 / (5/4)</gadget>
<output>80</output>

<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<result>20</result>