A fairy tale book is 15.5 yuan, and a story book is 12.8 yuan. How much did Xiao Ming spend in buying these two books?
一本童话书15.5元，一本故事书12.8元，小明买这两本书，一共用了多少元？
<gadget id="calculator">15.5 + 12.8</gadget>
<output>28.3</output>

<result>28.3</result>