Mom is going to buy 4 bottles of apple juice. The original price is 8 yuan per bottle. Now the supermarket is running a promotion. Buy 3 bottles of apple juice and get 1 free. Based on this calculation, how much is each bottle of apple juice cheaper now?
妈妈准备买4瓶苹果汁，原价每瓶8元，现在超市搞促销活动，苹果汁买3瓶送1瓶，照这样计算，现在每瓶苹果汁便宜多少钱？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 * (3/4)</gadget>
<output>6</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<result>2</result>