A pair of sneakers of a certain brand is sold at a price of 255 yuan after a 15% discount. How much is this pair of sneakers cheaper than the original price?
一双某种品牌的运动鞋打八五折后，以255元的价格卖出，这双运动鞋与原价相比便宜了多少元？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">255 / (17/20)</gadget>
<output>300</output>

<gadget id="calculator">300 - 255</gadget>
<output>45</output>

<result>45</result>