Mom bought 9.5 kilograms of oranges, paid 30 yuan to the fruit store, and got back 7.2 yuan. Please do the math, how much is the oranges bought per kilogram?
妈妈买了9.5千克橘子，付给水果商店30元，找回7.2元，请你算一算，买来的橘子每千克多少元？
<gadget id="calculator">30 - 7.2</gadget>
<output>22.8</output>

<gadget id="calculator">22.8 / 9.5</gadget>
<output>2.4</output>

<result>2.4</result>