Xiao Ming bought a box of Mengniu milk. There were 4 small boxes. He paid 50.4 yuan in total. How much is each small box of milk?
小明买了一箱蒙牛牛奶，有4小盒，共付50.4元，每小盒牛奶多少元？
<gadget id="calculator">50.4 / 4</gadget>
<output>12.6</output>

<result>12.6</result>