The current price of a coat is (1/10) lower than the original price, and the current price is the original ((())/(())).
一件大衣现在的价钱比原来降低了(1/10)，现在的价钱是原来的((())/(()))．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>