A travel agency in Tongren launched a promotional activity during the National Day. The "Huangguoshu Waterfall 4-Day Tour" was 20% off. After the discount, the price was 1200 yuan.
铜仁某旅行社在国庆期间推出优惠活动，"黄果树瀑布4日游"打八折，打折后要1200元，比原价便宜了多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_200 / (4/5)</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 - 1_200</gadget>
<output>300</output>

<result>300</result>