A piece of clothing is 85 yuan, which is 15% cheaper than before. How much is it?
一件衣服85元，比原来便宜15%，原来多少元？
<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>

<gadget id="calculator">85 / (17/20)</gadget>
<output>100</output>

<result>100</result>