The original price of a bicycle is 500 yuan, and now it is sold at a 20% discount. How much does it cost Xiao Ming to buy this bicycle now?
一辆自行车原价500元，现在打八折销售，小明现在买这辆自行车要花多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">500 * (4/5)</gadget>
<output>400</output>

<result>400</result>