Teacher Li spent 76.8 yuan to buy books, and 12 yuan to buy 5 kilograms of apples. She brought 100 yuan, how much is left?
李老师买书用去76.8元，买5千克苹果共用去12元，她带了100元，还剩下多少元？
<gadget id="calculator">100 - 76.8 - 12</gadget>
<output>11.2</output>

<result>11.2</result>