Xiao Ming bought 4 copies of "Blue Cat Naughty 3000 Questions", priced at 67.2 yuan, how much is the average price of each book?
小明购买了4本《蓝猫淘气3000问》，售价67.2元，平均每本售价多少元？
<gadget id="calculator">67.2 / 4</gadget>
<output>16.8</output>

<result>16.8</result>