A shirt with a 15% discount is 51 yuan, how much is the original price.
一件衬衫打八五折是51元，原价是多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">51 / (17/20)</gadget>
<output>60</output>

<result>60</result>