It costs 21.7 yuan to buy a doll, and 8.5 yuan to buy a teddy bear. How much is a doll more expensive than a teddy bear?
买一个布娃娃要21.7元，买一个玩具熊要8.5元．布娃娃比玩具熊贵多少元钱？
<gadget id="calculator">21.7 - 8.5</gadget>
<output>13.2</output>

<result>13.2</result>