A box of milk is 21.6 yuan, and a notebook is 2.5 yuan. How much does it cost to buy 2 cartons of milk and 1 notebook?
一箱牛奶21.6元，一本笔记本2.5元．买2箱牛奶和1本笔记本一共需要多少钱？
<gadget id="calculator">21.6 * 2</gadget>
<output>43.2</output>

<gadget id="calculator">43.2 + 2.5</gadget>
<output>45.7</output>

<result>45.7</result>