A pen is 8.45 yuan, and a notebook is 1.25 yuan cheaper than a pen. How much does it cost to buy a notebook and a pen?
一枝钢笔8.45元，一个笔记本比一枝钢笔便宜1.25元，买一个笔记本和一枝钢笔一共需多少元？
<gadget id="calculator">8.45 - 1.25</gadget>
<output>7.2</output>

<gadget id="calculator">7.2 + 8.45</gadget>
<output>15.65</output>

<result>15.65</result>