Mom bought a children's study table for Xiaohong, and the price was 1,200 yuan after a 20% discount. How much did you save by buying such a children's study table compared to before the discount?
妈妈给小红买了一张儿童学习桌，打八折后售价是1200元，买一张这样的儿童学习桌比打折前省了多少元钱？
<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>