There is a kind of clothes in the shop, the price is 68 yuan, 15% cheaper than the original price, how much cheaper than the original price?
商店有一种衣服，售价68元，比原价便宜15%，比原来定价便宜多少元？
<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">68 / (17/20)</gadget>
<output>80</output>

<gadget id="calculator">80 - 68</gadget>
<output>12</output>

<result>12</result>