Aunt Li bought lean meat for 15.70 yuan and pork ribs for 18.30 yuan. She paid 50 yuan, how much should she get back?
李阿姨买了15.70元的瘦肉，又买了18.30元的排骨，她付出50元，应找回多少元？
<gadget id="calculator">50 - 15.7 - 18.3</gadget>
<output>16</output>

<result>16</result>