There are 400 seats in a movie theater with two ticket prices, A and B. Each ticket is 5.5 yuan, and each ticket for B is 4.5 yuan. When a certain movie is shown, there are no seats. How much can this movie earn?
电影院有甲、乙两种票价的座位各400个，甲票每张5.5元，乙票每张4.5元，某场电影放映时座无虚席，这场电影可收入多少元？
<gadget id="calculator">5.5 + 4.5</gadget>
<output>10</output>

<gadget id="calculator">10 * 400</gadget>
<output>4_000</output>

<result>4_000</result>