Air conditioner sale in summer, the original price of an air conditioner is 8,100 yuan, and it is now on sale with a 20% discount. How much is the price now?
夏天空调促销，一款空调原价8100元，现在打八折出售．现在售价多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">8_100 * (4/5)</gadget>
<output>6_480</output>

<result>6_480</result>