Now the cost of each piece of clothing is 15% 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15%，现在每件衣服的成本是过去的多少．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>