Beibei wants to send two story books to her good friend Lili from afar. One is 15.4 yuan and the other is 9.8 yuan. The postage for these two books is 3.2 yuan. How much does Beibei cost in total?
贝贝要送远方的好朋友丽丽两本故事书，一本的价格15.4元，另一本的价钱是9.8元，邮寄这两本书共要交3.2元的邮费．贝贝一共要花多少钱？
<gadget id="calculator">15.4 + 9.8 + 3.2</gadget>
<output>28.4</output>

<result>28.4</result>