Aunt Wang bought 9.5 kilograms of apples, gave the salesperson 30 yuan, and got back 7.2 yuan. How much is each kilogram of apples?
王阿姨买了9.5千克苹果，给售货员30元，找回7.2元，每千克苹果多少元？
<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>