Mom buys a coat with a price tag of 498 yuan and participates in a 20% discount event. Mom pays the salesperson 400 yuan. How much should I get back?
妈妈买一件标价为498元的大衣，参加打八折的活动，妈妈付给营业员400元，应找回多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">498 * (4/5)</gadget>
<output>1_992/5 = around 398.4</output>

<gadget id="calculator">400 - (1_992/5)</gadget>
<output>8/5 = around 1.6</output>

<result>8/5 = around 1.6</result>