In the window of Xinhua Bookstore are three of Liangliang’s favorite books, priced at 22.30 yuan each for “Manga”, 30.70 yuan for each “Life Encyclopedia”, and 33.90 yuan for each “Mathematics World”. How much is the difference between the cheapest and the most expensive?
新华书店的橱窗里摆着3本亮亮最喜欢的书，标价为：《漫画》每本22.30元，《生活百科》每本30.70元，《数学大世界》每本33.90元．最便宜的与最贵相差多少元？
<gadget id="calculator">33.9 - 22.3</gadget>
<output>11.6</output>

<result>11.6</result>