A pair of table tennis rackets is 7.8 yuan, and a box of table tennis balls is 1.5 yuan. If you buy a pair of table tennis bats and a box of table tennis balls with 10 yuan, how much should you get back?
一副乒乓球拍7.8元，一盒乒乓球1.5元，用10元钱买一副乒乓球拍和一盒乒乓球，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>