Xiao Ming bought two reference books, "Composition" for 15.36 yuan, and "Fairy Tale" was 4.24 yuan more than "Composition". Xiao Ming gave the salesperson 40 yuan, how much should I get back?
小明买了两本参考书，《作文》15.36元，《童话故事》比《作文》多4.24元．小明给了售货员40元，应找回多少钱？
<gadget id="calculator">15.36 + 4.24</gadget>
<output>19.6</output>

<gadget id="calculator">40 - 15.36 - 19.6</gadget>
<output>5.04</output>

<result>5.04</result>