A stationery store has bought a batch of pens, 12 pens per box, 132 yuan per box at wholesale, 12 yuan per pen at retail price, the profit from selling 1 box at wholesale price is the same as selling 8 pens at retail price, then the purchase price is how much each
某文具店进了一批钢笔，每盒12支，批发每盒132元，零售价每支12元，用批发价卖出1盒与用零售价卖出8支的利润相同，则进货价为每支多少元
<gadget id="calculator">132 / 12</gadget>
<output>11</output>

<gadget id="calculator">11 * 12</gadget>
<output>132</output>

<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">132 - 96</gadget>
<output>36</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<result>9</result>