A small shop bought 350 bottles of beverages in January and 550 bottles of beverages in February. The income in February was 400 yuan more than in January. How much is the average amount of beverages per bottle?
某小店一月份买出饮料350瓶，二月份买出饮料550瓶，二月份比一月份多收入400元，平均每瓶饮料多少元？
<gadget id="calculator">550 - 350</gadget>
<output>200</output>

<gadget id="calculator">400 / 200</gadget>
<output>2</output>

<result>2</result>