A travel agency launched a promotional activity during the May 1st period. The "Huangshan Tour" originally priced at 2,600 yuan is now 15% off. How much is it cheaper than before?
某旅行社在五•一期间推出优惠活动，原价2600元的"黄山游"现在打八五折，比原来便宜了多少钱？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">2_600 * (3/20)</gadget>
<output>390</output>

<result>390</result>