Xiaoqiang has 12.5 yuan, and Lele has 18.5 yuan. They bought a set of "Grimm's Fairy Tales" together, and the difference is 8.2 yuan. How much is the price of this set of books?
小强有12.5元，乐乐有18.5元，两人合买一套《格林童话》，还差8.2元，这套书售价多少元？
<gadget id="calculator">12.5 + 18.5 + 8.2</gadget>
<output>39.2</output>

<result>39.2</result>