Xiaolan's mother brought 50 yuan to buy vegetables, and it cost 28.70 yuan to buy vegetables. How much money is left?
小兰的妈妈带50元钱去买菜，买菜用去28.70元，还剩多少元钱？
<gadget id="calculator">50 - 28.7</gadget>
<output>21.3</output>

<result>21.3</result>