Xiaoming's father bought 8 bottles of beer for 50 yuan, and the money he got back was just enough to buy 20 bottles of soft drinks with a unit price of 1.5 yuan. What is the unit price of the beer bought by Xiao Ming's father?
小明的爸爸用50元买了8瓶啤酒，找回的钱正好可以买20瓶单价为1.5元的汽水．小明的爸爸买的啤酒的单价是多少？
<gadget id="calculator">20 * 1.5</gadget>
<output>30</output>

<gadget id="calculator">50 - 30</gadget>
<output>20</output>

<gadget id="calculator">20 / 8</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>