To celebrate the National Day in Ginza, buy 5 bottles of Coke and get 1 free. It is known that each bottle of Coke is 12 yuan. If you buy 5 bottles at a time, how much is each bottle cheaper?
银座超市为庆祝"十一"国庆节，买5瓶可乐送1瓶，已知每瓶可乐12元，一次买5瓶，每瓶便宜多少钱？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<result>2</result>