"The current price of this coat is lower than the original (1/10)", here the amount is regarded as the unit "1", and the current price is the original ((())/(())).
"这件大衣现在的价钱比原来降低了(1/10)"，这里把多少看作单位"1"，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>