Now the cost of each piece of clothing is 10% lower than in the past, and now the cost of each piece of clothing is how much it used to be.
现在每件衣服的成本比过去降低了10%，现在每件衣服的成本是过去的多少．
<gadget id="calculator">10 / 100</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>