Youth travel agencies launched special promotions during New Year's Day. The "Huangshan Tour" originally priced at 2,800 yuan is now 15% off. How much is it cheaper than the original price?
青年旅行社在元旦期间推出优惠活动，原价2800元的"黄山游"现在打八五折，比原价便宜了多少钱？
<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_800 * (3/20)</gadget>
<output>420</output>

<result>420</result>