The original price of a set of suits in the tourist shopping mall is 420 yuan, and now there is a 20% discount for changing seasons. How much money can Uncle Li save by buying this suit?
旅游商场一套西服原价420元，现在换季打八折，李叔叔买这套衣服可节约多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">420 * (4/5)</gadget>
<output>336</output>

<gadget id="calculator">420 - 336</gadget>
<output>84</output>

<result>84</result>