A hardcover notebook is 16 yuan each, buy 5 and get 1 free, if you buy 8 at a time (including the free 1), how much is each notebook actually cheaper?
一种精装笔记本每本16元，买5本送1本，如果一次买8本(含赠送的1本)，实际每本便宜了多少元？
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">16 * (7/8)</gadget>
<output>14</output>

<gadget id="calculator">16 - 14</gadget>
<output>2</output>

<result>2</result>