Xiao Ming's father went to the United States on a business trip and brought back a pair of Nike sneakers for Xiao Ming, which cost exactly $87. If the exchange rate of 1 US dollar is 6.24 yuan at that time, how much is Xiao Ming’s pair of Nike shoes in RMB?
小明的爸爸出差到美国，给小明带回一双耐克运动鞋，正好花了87美元．如果按当时1美元兑换6.24元计算，小明这双耐克鞋折合人民币是多少元？
<gadget id="calculator">87 * 6.24</gadget>
<output>542.88</output>

<result>542.88</result>