Xiaoqing bought 4 AA batteries, paid 11.5 yuan, and got back 0.3 yuan. How much is the price of each AA battery?
小青买了4节五号电池，付出11.5元，找回0.3元．每节五号电池的价钱是多少元？
<gadget id="calculator">11.5 - 0.3</gadget>
<output>11.2</output>

<gadget id="calculator">11.2 / 4</gadget>
<output>2.8</output>

<result>2.8</result>