The summer vacation is coming, and my father plans to buy a pair of sports shoes and a skipping rope for Xiaohong to exercise. A pair of sports shoes is 38.5 yuan, a skipping rope is 4.8 yuan, and the salesperson is paid 50 yuan, how much should I get back?
暑假快到了，爸爸打算给小红买双运动鞋和一根跳绳锻炼身体．一双运动鞋38.5元，一根跳绳4.8元，付给售货员50元钱，还应找回多少元？
<gadget id="calculator">50 - 38.5 - 4.8</gadget>
<output>6.7</output>

<result>6.7</result>