It costs 7.6 yuan to sell a notebook, which is 3.45 yuan more expensive than a pencil case. How much does it cost to buy a pencil case?
卖一本笔记本要花7.6元，比一个文具盒贵3.45元，买一个文具盒需要多少元？
<gadget id="calculator">7.6 - 3.45</gadget>
<output>4.15</output>

<result>4.15</result>