A pencil is 0.8 yuan, and a pen is 2.7 yuan more expensive than a pencil. How much is a pen?
一支铅笔0.8元，一支钢笔比一支铅笔贵2.7元，一支钢笔多少元钱？
<gadget id="calculator">0.8 + 2.7</gadget>
<output>3.5</output>

<result>3.5</result>