Zhang Lin wants to practice playing table tennis. A table tennis racket costs 7.8 yuan and a table tennis ball costs 1.5 yuan. Zhang Lin bought a racket and a table tennis ball with 10 yuan. How much should he get back?
张林要练习打乒乓球，一支乒乓球拍7.8元，一个乒乓球1.5元，张林带了10元钱买了一支球拍和一个乒乓球，应找回多少钱？
<gadget id="calculator">7.8 + 1.5</gadget>
<output>9.3</output>

<gadget id="calculator">10 - 9.3</gadget>
<output>0.7</output>

<result>0.7</result>