Dongdong bought 5 books, the prices are 8.5 yuan, 9.2 yuan, 8.2 yuan, 9.1 yuan, 8.8 yuan. What is the difference between the cheapest and the most expensive of these five books?
东东买了5本书，价格分别是8.5元、9.2元、8.2元、9.1元、8.8元．这5本书中最便宜的和最贵的相差多少元．
<gadget id="calculator">9.2 - 8.2</gadget>
<output>1</output>

<result>1</result>