Class 5 and 3 need to buy 8 notebooks and 8 pens as prizes to reward students who have made progress in their studies. It cost 102.4 yuan to buy a notebook and 28 yuan to buy a pen. How much does a notebook cost more than a pen?
五3班要买8本笔记本和8枝钢笔作为奖品奖励学习进步的同学．买笔记本用了102.4元，买钢笔用了28元．一本笔记本比一枝钢笔贵多少元？
<gadget id="calculator">102.4 / 8</gadget>
<output>12.8</output>

<gadget id="calculator">28 / 8</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">12.8 - (7/2)</gadget>
<output>9.3</output>

<result>9.3</result>