Aunt Li brought 50 yuan to buy vegetables, 28.7 yuan to buy meat dishes, and 8.5 yuan to buy vegetarian dishes. How much money do you have left?
李阿姨带50元钱去买菜，买荤菜用去28.7元，买素菜用去8.5元．还剩下多少元？
<gadget id="calculator">50 - 28.7 - 8.5</gadget>
<output>12.8</output>

<result>12.8</result>